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html

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html

<header>
    <h1>Pure <strong>CSS</strong> Toggles</h1>
</header>
<form>
    <fieldset>
        <legend>Flat look</legend>
        <div>
            <input type="checkbox" id="pure-toggle-0" hidden/>
            <label class="pure-toggle" for="pure-toggle-0"><span class="fontawesome-ok"></span><span class="fontawesome-remove"></span></label>
        </div>
        <div>
            <input type="checkbox" id="pure-toggle-1" hidden checked="checked" />
            <label class="pure-toggle flip" for="pure-toggle-1"><span class="fontawesome-ok"></span><span class="fontawesome-remove"></span></label>
        </div>
        <div>
            <input type="checkbox" id="pure-toggle-2" hidden />
            <label class="pure-toggle impossible" for="pure-toggle-2"><span class="fontawesome-ok"></span><span class="fontawesome-remove"></span></label>
        </div>
        <div>
            <input type="checkbox" id="pure-toggle-3" hidden checked="checked" />
            <label class="pure-toggle wide" for="pure-toggle-3"><span class="fontawesome-ok"></span><span class="fontawesome-remove"></span></label>
        </div>
    </fieldset>
    <fieldset>
        <legend>3D look</legend>
        <div>
            <input type="checkbox" id="pure-toggle-4" hidden />
            <label class="pure-toggle brick" for="pure-toggle-4"><span class="fontawesome-ok"></span><span class="fontawesome-remove"></span></label>
        </div>
        <div>
            <input type="checkbox" id="pure-toggle-5" hidden />
            <label class="pure-toggle brick switch" for="pure-toggle-5"><span class="fontawesome-ok ok"></span><span class="fontawesome-remove no ok"></span></label>
        </div>
    </fieldset>
</form>

css

@charset "UTF-8";
@import url(http://weloveiconfonts.com/api/?family=fontawesome);
@import url(http://fonts.googleapis.com/css?family=Open+Sans:700,300);
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
  margin: 0;
  padding: 0;
  border: 0;
  font: inherit;
  font-size: 100%;
  vertical-align: baseline;
}

html {
  line-height: 1;
}

ol, ul {
  list-style: none;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

caption, th, td {
  text-align: left;
  font-weight: normal;
  vertical-align: middle;
}

q, blockquote {
  quotes: none;
}
q:before, q:after, blockquote:before, blockquote:after {
  content: "";
  content: none;
}

a img {
  border: none;
}

article, aside, details, figcaption, figure, footer, header, hgroup, main, menu, nav, section, summary {
  display: block;
}

body {
  background-color: #d0d0d0;
  text-align: center;
  font-family: "Open Sans", sans-serif;
  font-size: 16px;
  color: #444444;
}

header {
  margin-bottom: 2em;
}

h1 {
  font-size: 2em;
  margin: 2em 0 1em;
}

strong {
  font-weight: 700;
}

legend {
  font-size: 1.5em;
  line-height: 1em;
  margin-bottom: 1.9em;
  padding-bottom: 1.5em;
  border-bottom: 1px solid #444444;
  width: 100%;
}

div {
  margin-bottom: 1em;
}

fieldset {
  border: 0;
  padding: 0 2em 2em;
}

.pure-toggle {
  cursor: pointer;
  font-size: 1.5em;
  width: 6em;
  height: 3em;
  display: inline-block;
  position: relative;
  background: white;
  text-align: left;
  line-height: 3em;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  -moz-perspective: 300px;
  -webkit-perspective: 300px;
  perspective: 300px;
}
.pure-toggle:before {
  width: 3em;
  height: 3em;
  position: absolute;
  right: 0;
  top: 0;
  background-color: #f5f5f5;
  display: inline-block;
  text-align: center;
  font-family: 'FontAwesome', sans-serif;
  content: "???";
  color: #ffffff;
  -moz-transition: all 1s ease-in-out;
  -o-transition: all 1s ease-in-out;
  -webkit-transition: all 1s ease-in-out;
  transition: all 1s ease-in-out;
  -moz-transform-origin: 0% 50%;
  -ms-transform-origin: 0% 50%;
  -webkit-transform-origin: 0% 50%;
  transform-origin: 0% 50%;
  /*@include box-shadow(0.1em 0 0.2em rgba(0,0,0,0.3));*/
}
.pure-toggle [class^='fontawesome-'] {
  padding: 1em;
  line-height: inherit;
  font-family: 'FontAwesome', sans-serif;
  -moz-transition: all 1s ease-in-out;
  -o-transition: all 1s ease-in-out;
  -webkit-transition: all 1s ease-in-out;
  transition: all 1s ease-in-out;
}
.pure-toggle.flip:before {
  -moz-transform-origin: 50% 50%;
  -ms-transform-origin: 50% 50%;
  -webkit-transform-origin: 50% 50%;
  transform-origin: 50% 50%;
}
.pure-toggle.brick {
  background-color: white;
  border: 1px solid #d9d9d9;
  border-bottom-color: #e6e6e6;
  -moz-box-shadow: inset 0 0.1em 0.03em rgba(0, 0, 0, 0.2), inset 0 0.1em 0.3em rgba(0, 0, 0, 0.3), 0 0 2em rgba(255, 255, 255, 0.6);
  -webkit-box-shadow: inset 0 0.1em 0.03em rgba(0, 0, 0, 0.2), inset 0 0.1em 0.3em rgba(0, 0, 0, 0.3), 0 0 2em rgba(255, 255, 255, 0.6);
  box-shadow: inset 0 0.1em 0.03em rgba(0, 0, 0, 0.2), inset 0 0.1em 0.3em rgba(0, 0, 0, 0.3), 0 0 2em rgba(255, 255, 255, 0.6);
}
.pure-toggle.brick:before {
  margin-right: -1px;
  margin-top: -0.14em;
  -moz-box-shadow: 0 0.12em 0.01em #3ba5bc, 0 0.12em 0.3em rgba(59, 165, 188, 0.6), 0 0.12em 2em rgba(0, 0, 0, 0.3), -0.12em 0.15em 0.2em rgba(0, 0, 0, 0.2);
  -webkit-box-shadow: 0 0.12em 0.01em #3ba5bc, 0 0.12em 0.3em rgba(59, 165, 188, 0.6), 0 0.12em 2em rgba(0, 0, 0, 0.3), -0.12em 0.15em 0.2em rgba(0, 0, 0, 0.2);
  box-shadow: 0 0.12em 0.01em #3ba5bc, 0 0.12em 0.3em rgba(59, 165, 188, 0.6), 0 0.12em 2em rgba(0, 0, 0, 0.3), -0.12em 0.15em 0.2em rgba(0, 0, 0, 0.2);
  -moz-transition-duration: 0.66667s;
  -o-transition-duration: 0.66667s;
  -webkit-transition-duration: 0.66667s;
  transition-duration: 0.66667s;
  -moz-transition-timing-function: cubic-bezier(0.52, -0.41, 0.55, 1.46);
  -o-transition-timing-function: cubic-bezier(0.52, -0.41, 0.55, 1.46);
  -webkit-transition-timing-function: cubic-bezier(0.52, -0.41, 0.55, 1.46);
  transition-timing-function: cubic-bezier(0.52, -0.41, 0.55, 1.46);
}
.pure-toggle.brick.switch {
  background: transparent;
  -moz-box-shadow: inset 0 0 0.03em transparent, inset 0 0 0.3em transparent, 0 0 2em rgba(255, 255, 255, 0);
  -webkit-box-shadow: inset 0 0 0.03em transparent, inset 0 0 0.3em transparent, 0 0 2em rgba(255, 255, 255, 0);
  box-shadow: inset 0 0 0.03em transparent, inset 0 0 0.3em transparent, 0 0 2em rgba(255, 255, 255, 0);
  border: 0;
}
.pure-toggle.brick.switch:before {
  display: none;
}
.pure-toggle.brick.switch .ok {
  color: white;
  top: 0;
  left: 1px;
  line-height: 1em;
  padding: 1em 1.045em;
  position: relative;
  background: #5EB9CC;
  -moz-box-shadow: 0 0.12em 0.01em #3ba5bc, 0 0.12em 0.3em rgba(59, 165, 188, 0.6), 0 0.12em 2em rgba(0, 0, 0, 0.3), -0.12em 0.15em 0.2em rgba(0, 0, 0, 0.2);
  -webkit-box-shadow: 0 0.12em 0.01em #3ba5bc, 0 0.12em 0.3em rgba(59, 165, 188, 0.6), 0 0.12em 2em rgba(0, 0, 0, 0.3), -0.12em 0.15em 0.2em rgba(0, 0, 0, 0.2);
  box-shadow: 0 0.12em 0.01em #3ba5bc, 0 0.12em 0.3em rgba(59, 165, 188, 0.6), 0 0.12em 2em rgba(0, 0, 0, 0.3), -0.12em 0.15em 0.2em rgba(0, 0, 0, 0.2);
  -moz-transition-duration: 0.33333s;
  -o-transition-duration: 0.33333s;
  -webkit-transition-duration: 0.33333s;
  transition-duration: 0.33333s;
}
.pure-toggle.brick.switch .ok.no {
  top: 0.14em;
  background: transparent;
  background: #cc0966;
  -moz-box-shadow: 0 0 0.01em #9b074e, 0 0 0.3em rgba(155, 7, 78, 0.6), 0 0.12em 2em transparent, -0.12em 0.15em 0.2em transparent;
  -webkit-box-shadow: 0 0 0.01em #9b074e, 0 0 0.3em rgba(155, 7, 78, 0.6), 0 0.12em 2em transparent, -0.12em 0.15em 0.2em transparent;
  box-shadow: 0 0 0.01em #9b074e, 0 0 0.3em rgba(155, 7, 78, 0.6), 0 0.12em 2em transparent, -0.12em 0.15em 0.2em transparent;
}

input[type='checkbox'] + .pure-toggle:before {
  -moz-transform: rotateY(0deg);
  -ms-transform: rotateY(0deg);
  -webkit-transform: rotateY(0deg);
  transform: rotateY(0deg);
  background-color: #5EB9CC;
}
input[type='checkbox'] + .pure-toggle [class^="fontawesome-"],
input[type='checkbox'] + .pure-toggle [class*="fontawesome-"] {
  color: #5EB9CC;
}
input[type='checkbox'] + .pure-toggle.wide:before {
  -moz-transform: rotateY(0deg);
  -ms-transform: rotateY(0deg);
  -webkit-transform: rotateY(0deg);
  transform: rotateY(0deg);
  -moz-animation: contract 1s ease-in-out forwards;
  -webkit-animation: contract 1s ease-in-out forwards;
  animation: contract 1s ease-in-out forwards;
}
input[type='checkbox'] + .pure-toggle.brick:before {
  border-bottom: 0.03em solid #71c1d2;
  text-shadow: 0 0.05em 0 #4bb1c6;
  -moz-transform: rotateY(0deg);
  -ms-transform: rotateY(0deg);
  -webkit-transform: rotateY(0deg);
  transform: rotateY(0deg);
}
input[type='checkbox'] + .pure-toggle.brick.switch .ok {
  color: white;
}
input[type='checkbox'] + .pure-toggle.flip:before {
  -moz-animation: flip 0.5s ease-in-out forwards;
  -webkit-animation: flip 0.5s ease-in-out forwards;
  animation: flip 0.5s ease-in-out forwards;
}
input[type='checkbox'] + .pure-toggle.impossible:before {
  -moz-animation: impossible 0.5s ease-in-out forwards;
  -webkit-animation: impossible 0.5s ease-in-out forwards;
  animation: impossible 0.5s ease-in-out forwards;
}

input[type='checkbox']:checked + .pure-toggle:before {
  -moz-transform: rotateY(-180deg);
  -ms-transform: rotateY(-180deg);
  -webkit-transform: rotateY(-180deg);
  transform: rotateY(-180deg);
  background-color: #cc0966;
}
input[type='checkbox']:checked + .pure-toggle [class^="fontawesome-"],
input[type='checkbox']:checked + .pure-toggle [class*="fontawesome-"] {
  color: #cc0966;
}
input[type='checkbox']:checked + .pure-toggle.wide:before {
  -moz-transform: rotateY(0deg);
  -ms-transform: rotateY(0deg);
  -webkit-transform: rotateY(0deg);
  transform: rotateY(0deg);
  -moz-animation: expand 1s ease-in-out forwards;
  -webkit-animation: expand 1s ease-in-out forwards;
  animation: expand 1s ease-in-out forwards;
}
input[type='checkbox']:checked + .pure-toggle.brick:before {
  margin-right: 3em;
  border-bottom: 0.03em solid #f5137f;
  text-shadow: 0 0.05em 0 #9b074e;
  -moz-transform: rotateY(0deg);
  -ms-transform: rotateY(0deg);
  -webkit-transform: rotateY(0deg);
  transform: rotateY(0deg);
  -moz-box-shadow: 0 0.12em 0.01em #9b074e, 0 0.12em 0.3em rgba(155, 7, 78, 0.6), 0 0.12em 2em rgba(0, 0, 0, 0.3), 0.12em 0.15em 0.2em rgba(0, 0, 0, 0.2);
  -webkit-box-shadow: 0 0.12em 0.01em #9b074e, 0 0.12em 0.3em rgba(155, 7, 78, 0.6), 0 0.12em 2em rgba(0, 0, 0, 0.3), 0.12em 0.15em 0.2em rgba(0, 0, 0, 0.2);
  box-shadow: 0 0.12em 0.01em #9b074e, 0 0.12em 0.3em rgba(155, 7, 78, 0.6), 0 0.12em 2em rgba(0, 0, 0, 0.3), 0.12em 0.15em 0.2em rgba(0, 0, 0, 0.2);
}
input[type='checkbox']:checked + .pure-toggle.brick.switch:before {
  display: none;
}
input[type='checkbox']:checked + .pure-toggle.brick.switch .ok {
  top: 0.14em;
  -moz-box-shadow: 0 0 0.01em #3ba5bc, 0 0 0.3em rgba(59, 165, 188, 0.6), 0 0.12em 2em transparent, -0.12em 0.15em 0.2em transparent;
  -webkit-box-shadow: 0 0 0.01em #3ba5bc, 0 0 0.3em rgba(59, 165, 188, 0.6), 0 0.12em 2em transparent, -0.12em 0.15em 0.2em transparent;
  box-shadow: 0 0 0.01em #3ba5bc, 0 0 0.3em rgba(59, 165, 188, 0.6), 0 0.12em 2em transparent, -0.12em 0.15em 0.2em transparent;
}
input[type='checkbox']:checked + .pure-toggle.brick.switch .ok.no {
  top: 0;
  background: #cc0966;
  -moz-box-shadow: 0 0.12em 0.01em #9b074e, 0 0.12em 0.3em rgba(155, 7, 78, 0.6), 0 0.12em 2em rgba(0, 0, 0, 0.3), 0.12em 0.15em 0.2em rgba(0, 0, 0, 0.2);
  -webkit-box-shadow: 0 0.12em 0.01em #9b074e, 0 0.12em 0.3em rgba(155, 7, 78, 0.6), 0 0.12em 2em rgba(0, 0, 0, 0.3), 0.12em 0.15em 0.2em rgba(0, 0, 0, 0.2);
  box-shadow: 0 0.12em 0.01em #9b074e, 0 0.12em 0.3em rgba(155, 7, 78, 0.6), 0 0.12em 2em rgba(0, 0, 0, 0.3), 0.12em 0.15em 0.2em rgba(0, 0, 0, 0.2);
}
input[type='checkbox']:checked + .pure-toggle.flip:before {
  -moz-animation: flip-back 0.5s ease-in-out forwards;
  -webkit-animation: flip-back 0.5s ease-in-out forwards;
  animation: flip-back 0.5s ease-in-out forwards;
}
input[type='checkbox']:checked + .pure-toggle.impossible:before {
  -moz-animation: impossible-back 0.5s ease-in-out forwards;
  -webkit-animation: impossible-back 0.5s ease-in-out forwards;
  animation: impossible-back 0.5s ease-in-out forwards;
}

@keyframes flip-back {
  0% {
    -moz-transform: rotateY(0deg) translateX(0) scale(1);
    -ms-transform: rotateY(0deg) translateX(0) scale(1);
    -webkit-transform: rotateY(0deg) translateX(0) scale(1);
    transform: rotateY(0deg) translateX(0) scale(1);
  }
  60%,
    80% {
    -moz-transform: rotateY(-360deg) translateX(0) scale(1.3);
    -ms-transform: rotateY(-360deg) translateX(0) scale(1.3);
    -webkit-transform: rotateY(-360deg) translateX(0) scale(1.3);
    transform: rotateY(-360deg) translateX(0) scale(1.3);
  }
  100% {
    margin-right: 3em;
    -moz-transform: rotateY(-360deg) translateX(0) scale(1);
    -ms-transform: rotateY(-360deg) translateX(0) scale(1);
    -webkit-transform: rotateY(-360deg) translateX(0) scale(1);
    transform: rotateY(-360deg) translateX(0) scale(1);
  }
}
@keyframes flip {
  0% {
    margin-right: 3em;
    -moz-transform: rotateY(0deg) translateX(0) scale(1);
    -ms-transform: rotateY(0deg) translateX(0) scale(1);
    -webkit-transform: rotateY(0deg) translateX(0) scale(1);
    transform: rotateY(0deg) translateX(0) scale(1);
  }
  60%,
    80% {
    -moz-transform: rotateY(360deg) translateX(0) scale(1.3);
    -ms-transform: rotateY(360deg) translateX(0) scale(1.3);
    -webkit-transform: rotateY(360deg) translateX(0) scale(1.3);
    transform: rotateY(360deg) translateX(0) scale(1.3);
  }
  100% {
    margin-right: 0;
    -moz-transform: rotateY(360deg) translateX(0) scale(1);
    -ms-transform: rotateY(360deg) translateX(0) scale(1);
    -webkit-transform: rotateY(360deg) translateX(0) scale(1);
    transform: rotateY(360deg) translateX(0) scale(1);
  }
}
@keyframes impossible-back {
  0% {
    -moz-transform: rotateX(0deg) translateX(0) scale(1);
    -ms-transform: rotateX(0deg) translateX(0) scale(1);
    -webkit-transform: rotateX(0deg) translateX(0) scale(1);
    transform: rotateX(0deg) translateX(0) scale(1);
  }
  60%,
    80% {
    -moz-transform: rotateX(-360deg) translateX(0) scale(1.3);
    -ms-transform: rotateX(-360deg) translateX(0) scale(1.3);
    -webkit-transform: rotateX(-360deg) translateX(0) scale(1.3);
    transform: rotateX(-360deg) translateX(0) scale(1.3);
  }
  100% {
    margin-right: 3em;
    -moz-transform: rotateX(-360deg) translateX(0) scale(1);
    -ms-transform: rotateX(-360deg) translateX(0) scale(1);
    -webkit-transform: rotateX(-360deg) translateX(0) scale(1);
    transform: rotateX(-360deg) translateX(0) scale(1);
  }
}
@keyframes impossible {
  0% {
    margin-right: 3em;
    -moz-transform: rotateX(0deg) translateX(0) scale(1);
    -ms-transform: rotateX(0deg) translateX(0) scale(1);
    -webkit-transform: rotateX(0deg) translateX(0) scale(1);
    transform: rotateX(0deg) translateX(0) scale(1);
  }
  60%,
    80% {
    -moz-transform: rotateX(360deg) translateX(0) scale(1.3);
    -ms-transform: rotateX(360deg) translateX(0) scale(1.3);
    -webkit-transform: rotateX(360deg) translateX(0) scale(1.3);
    transform: rotateX(360deg) translateX(0) scale(1.3);
  }
  100% {
    margin-right: 0;
    -moz-transform: rotateX(360deg) translateX(0) scale(1);
    -ms-transform: rotateX(360deg) translateX(0) scale(1);
    -webkit-transform: rotateX(360deg) translateX(0) scale(1);
    transform: rotateX(360deg) translateX(0) scale(1);
  }
}
@keyframes expand {
  0% {
    right: 0;
    width: 3em;
  }
  25% {
    right: 0;
    width: 100%;
  }
  50% {
    right: auto;
    width: 100%;
    left: 0;
  }
  100% {
    left: 0;
    width: 3em;
  }
}
@keyframes contract {
  0% {
    left: 0;
    width: 3em;
  }
  25% {
    left: 0;
    width: 100%;
  }
  50% {
    right: 0;
    width: 100%;
    left: auto;
  }
  100% {
    right: 0;
    width: 3em;
  }
}
@-webkit-keyframes flip-back {
  0% {
    -moz-transform: rotateY(0deg) translateX(0) scale(1);
    -ms-transform: rotateY(0deg) translateX(0) scale(1);
    -webkit-transform: rotateY(0deg) translateX(0) scale(1);
    transform: rotateY(0deg) translateX(0) scale(1);
  }
  60%,
    80% {
    -moz-transform: rotateY(-360deg) translateX(0) scale(1.3);
    -ms-transform: rotateY(-360deg) translateX(0) scale(1.3);
    -webkit-transform: rotateY(-360deg) translateX(0) scale(1.3);
    transform: rotateY(-360deg) translateX(0) scale(1.3);
  }
  100% {
    margin-right: 3em;
    -moz-transform: rotateY(-360deg) translateX(0) scale(1);
    -ms-transform: rotateY(-360deg) translateX(0) scale(1);
    -webkit-transform: rotateY(-360deg) translateX(0) scale(1);
    transform: rotateY(-360deg) translateX(0) scale(1);
  }
}
@-webkit-keyframes flip {
  0% {
    margin-right: 3em;
    -moz-transform: rotateY(0deg) translateX(0) scale(1);
    -ms-transform: rotateY(0deg) translateX(0) scale(1);
    -webkit-transform: rotateY(0deg) translateX(0) scale(1);
    transform: rotateY(0deg) translateX(0) scale(1);
  }
  60%,
    80% {
    -moz-transform: rotateY(360deg) translateX(0) scale(1.3);
    -ms-transform: rotateY(360deg) translateX(0) scale(1.3);
    -webkit-transform: rotateY(360deg) translateX(0) scale(1.3);
    transform: rotateY(360deg) translateX(0) scale(1.3);
  }
  100% {
    margin-right: 0;
    -moz-transform: rotateY(360deg) translateX(0) scale(1);
    -ms-transform: rotateY(360deg) translateX(0) scale(1);
    -webkit-transform: rotateY(360deg) translateX(0) scale(1);
    transform: rotateY(360deg) translateX(0) scale(1);
  }
}
@-webkit-keyframes impossible-back {
  0% {
    -moz-transform: rotateX(0deg) translateX(0) scale(1);
    -ms-transform: rotateX(0deg) translateX(0) scale(1);
    -webkit-transform: rotateX(0deg) translateX(0) scale(1);
    transform: rotateX(0deg) translateX(0) scale(1);
  }
  60%,
    80% {
    -moz-transform: rotateX(-360deg) translateX(0) scale(1.3);
    -ms-transform: rotateX(-360deg) translateX(0) scale(1.3);
    -webkit-transform: rotateX(-360deg) translateX(0) scale(1.3);
    transform: rotateX(-360deg) translateX(0) scale(1.3);
  }
  100% {
    margin-right: 3em;
    -moz-transform: rotateX(-360deg) translateX(0) scale(1);
    -ms-transform: rotateX(-360deg) translateX(0) scale(1);
    -webkit-transform: rotateX(-360deg) translateX(0) scale(1);
    transform: rotateX(-360deg) translateX(0) scale(1);
  }
}
@-webkit-keyframes impossible {
  0% {
    margin-right: 3em;
    -moz-transform: rotateX(0deg) translateX(0) scale(1);
    -ms-transform: rotateX(0deg) translateX(0) scale(1);
    -webkit-transform: rotateX(0deg) translateX(0) scale(1);
    transform: rotateX(0deg) translateX(0) scale(1);
  }
  60%,
    80% {
    -moz-transform: rotateX(360deg) translateX(0) scale(1.3);
    -ms-transform: rotateX(360deg) translateX(0) scale(1.3);
    -webkit-transform: rotateX(360deg) translateX(0) scale(1.3);
    transform: rotateX(360deg) translateX(0) scale(1.3);
  }
  100% {
    margin-right: 0;
    -moz-transform: rotateX(360deg) translateX(0) scale(1);
    -ms-transform: rotateX(360deg) translateX(0) scale(1);
    -webkit-transform: rotateX(360deg) translateX(0) scale(1);
    transform: rotateX(360deg) translateX(0) scale(1);
  }
}
@-webkit-keyframes expand {
  0% {
    right: 0;
    width: 3em;
  }
  25% {
    right: 0;
    width: 100%;
  }
  50% {
    right: auto;
    width: 100%;
    left: 0;
  }
  100% {
    left: 0;
    width: 3em;
  }
}
@-webkit-keyframes contract {
  0% {
    left: 0;
    width: 3em;
  }
  25% {
    left: 0;
    width: 100%;
  }
  50% {
    right: 0;
    width: 100%;
    left: auto;
  }
  100% {
    right: 0;
    width: 3em;
  }
}

JavaScript

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