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        <path d="M12.146803,1.97288306 L11.9871708,2.02457351 C10.359694,2.56706579 9.19347364,4.38968566 8.55435901,7.59815296 L8.48790243,7.94722512 L8.40134193,8.42330786 L7.93190172,8.54066791 C5.60979812,9.12119381 4.5,10.6471662 4.5,13.313061 C4.5,15.9954128 5.34482735,18.2241051 7.04341216,20.0379554 L7.28033009,20.282731 L7.5,20.5024009 L7.5,34 L4.5,34 L4.5,20.5024009 L4.28033009,20.282731 C2.42337534,18.4257762 1.5,16.1173379 1.5,13.313061 C1.5,10.6471662 2.60979812,9.12119381 4.93190172,8.54066791 L5.40134193,8.42330786 L5.48790243,7.94722512 C6.11076052,4.52150561 7.30156981,2.58644052 8.98717082,2.02457351 C10.1099844,1.65030233 11.1553025,1.63142458 12.146803,1.97288306 Z" fill="var(--paw-clap-shadow)"></path>
        <path d="M29,12.813061 C29,9.9391533 27.4240531,8.03364289 24.4355571,7.21065466 C24.0076525,3.9347868 22.7345972,1.71683414 20.5854102,0.642240647 C18.464427,-0.418250938 16.3124373,-0.158512501 14.2369156,1.37034347 C12.4952684,0.178909945 10.5640578,-0.0821942985 8.51282918,0.601548566 C6.29105947,1.34213847 4.84205262,3.58191705 4.10108646,7.21697394 C1.39604257,8.06878334 0,10.155857 0,13.313061 C0,16.3976705 1.00305875,19.0125677 3,21.1178657 L3,34 L4.5,34 L4.5,20.5024009 L4.28033009,20.282731 C2.42337534,18.4257762 1.5,16.1173379 1.5,13.313061 C1.5,10.6471662 2.60979812,9.12119381 4.93190172,8.54066791 L5.40134193,8.42330786 L5.48790243,7.94722512 C6.11076052,4.52150561 7.30156981,2.58644052 8.98717082,2.02457351 C10.7449132,1.4386594 12.3127354,1.72371798 13.7814787,2.89871265 L14.2596812,3.28127461 L14.7301383,2.889227 C16.5115081,1.40475216 18.1951255,1.12414927 19.9145898,1.98388143 C21.651916,2.85254456 22.6936777,4.78724477 23.0037221,7.88768883 L23.0577045,8.42751297 L23.5873022,8.54520133 C26.260051,9.13914552 27.5,10.5168667 27.5,12.813061 C27.5,15.28217 26.4070465,17.7803495 24.1855675,20.3191826 L24,20.5312597 L24,34 L25.5,34 L25.5,21.0920704 C27.8223642,18.3671442 29,15.6039027 29,12.813061 Z" fill="var(--paw-clap-border)"></path>
    </symbol>
</svg>

css

.paw-button {
  --background: #fff;
  --background-active: #FEE8F4;
  --border: #F1ECEB;
  --border-active: #EEC2DB;
  --text: #000;
  --number: #9C9496;
  --number-active: #000;
  --heart-background: #fff;
  --heart-background-active: #FEA5D7;
  --heart-border: #C3C2C0;
  --heart-border-active: #2B2926;
  --heart-shadow-light: #FEE0F2;
  --heart-shadow-dark: #EA5DAF;
  --paw-background: #fff;
  --paw-border: #201E1B;
  --paw-shadow: #EEEDED;
  --paw-inner: var(--heart-background-active);
  --paw-shadow-light: var(--heart-shadow-light);
  --paw-shadow-dark: var(--heart-shadow-dark);
  --paw-clap-background: #FEF0A5;
  --paw-clap-border: var(--paw-border);
  --paw-clap-shadow: #FED75C;
  --circle: #df3dce;
  --circle-line: #000;
  display: inline-flex;
  text-decoration: none;
  font-weight: bold;
  position: relative;
  line-height: 19px;
  padding: 12px 16px;
}
.paw-button:before {
  content: '';
  position: absolute;
  display: block;
  left: -2px;
  top: -2px;
  bottom: -2px;
  right: -2px;
  z-index: 1;
  border-radius: 5px;
  transition: background .45s, border-color .45s;
  background: var(--background);
  border: 2px solid var(--border);
}
.paw-button svg {
  display: block;
}
.paw-button .text {
  position: relative;
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  -webkit-transform: translateZ(0);
          transform: translateZ(0);
  z-index: 3;
  margin-right: 8px;
  transition: width .25s;
  width: var(--w, 60px);
}
.paw-button .text span,
.paw-button .text svg {
  transition: opacity .2s, -webkit-transform .15s ease-out;
  transition: transform .15s ease-out, opacity .2s;
  transition: transform .15s ease-out, opacity .2s, -webkit-transform .15s ease-out;
  opacity: var(--o, 1);
}
.paw-button .text span {
  display: block;
  position: absolute;
  left: 30px;
  top: 0;
  -webkit-transform: translateY(var(--y, 0));
          transform: translateY(var(--y, 0));
  color: var(--text);
}
.paw-button .text svg {
  --background: var(--heart-background);
  --border: var(--heart-border);
  --shadow-light: transparent;
  --shadow-dark: transparent;
  width: 21px;
  height: 19px;
  -webkit-transform: translateX(var(--x));
          transform: translateX(var(--x));
}
.paw-button > span {
  display: block;
  position: relative;
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  -webkit-transform: translateZ(0);
          transform: translateZ(0);
  z-index: 2;
  color: var(--number);
}
.paw-button .paws {
  overflow: hidden;
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 60px;
  z-index: 2;
}
.paw-button .paws svg {
  position: absolute;
  bottom: 0;
  transition: opacity .2s, -webkit-transform .3s ease-out;
  transition: transform .3s ease-out, opacity .2s;
  transition: transform .3s ease-out, opacity .2s, -webkit-transform .3s ease-out;
  opacity: var(--o, 0);
  -webkit-transform: translate(var(--x, 0), var(--y, 0));
          transform: translate(var(--x, 0), var(--y, 0));
}
.paw-button .paws svg.paw {
  --x: -24px;
  width: 30px;
  height: 37px;
  left: 32px;
}
.paw-button .paws svg.paw-clap {
  --x: 16px;
  --y: 34px;
  --o: 1;
  width: 29px;
  height: 34px;
  left: 34px;
}
.paw-button .paws .paw-effect {
  left: 26px;
  top: 12px;
  width: 44px;
  height: 44px;
  position: absolute;
}
.paw-button .paws .paw-effect:before {
  content: '';
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: var(--circle);
  -webkit-transform: scale(var(--s, 0));
          transform: scale(var(--s, 0));
  opacity: var(--o, 1);
  transition: opacity .2s linear .25s, -webkit-transform .15s ease .16s;
  transition: transform .15s ease .16s, opacity .2s linear .25s;
  transition: transform .15s ease .16s, opacity .2s linear .25s, -webkit-transform .15s ease .16s;
}
.paw-button .paws .paw-effect div {
  width: 2px;
  height: 6px;
  border-radius: 1px;
  left: 50%;
  bottom: 50%;
  margin-left: -1px;
  position: absolute;
  background: var(--circle-line);
  -webkit-transform: translateY(-24px) scaleX(0.7) scaleY(var(--s, 0));
          transform: translateY(-24px) scaleX(0.7) scaleY(var(--s, 0));
}
.paw-button .paws .paw-effect div:before, .paw-button .paws .paw-effect div:after {
  content: '';
  display: block;
  position: absolute;
  width: 100%;
  height: 100%;
  background: inherit;
  border-radius: inherit;
  -webkit-transform: translate(var(--x, -22px), var(--y, 4px)) rotate(var(--r, -45deg)) scaleX(0.8) scaleY(var(--s, 0));
          transform: translate(var(--x, -22px), var(--y, 4px)) rotate(var(--r, -45deg)) scaleX(0.8) scaleY(var(--s, 0));
}
.paw-button .paws .paw-effect div:after {
  --x: 22px;
  --r: 45deg;
}
.paw-button .paws .paw-effect div,
.paw-button .paws .paw-effect div:before,
.paw-button .paws .paw-effect div:after {
  opacity: var(--o, 1);
  -webkit-transform-origin: 50% 100%;
          transform-origin: 50% 100%;
  transition: opacity .18s linear .21s, -webkit-transform .12s ease .17s;
  transition: transform .12s ease .17s, opacity .18s linear .21s;
  transition: transform .12s ease .17s, opacity .18s linear .21s, -webkit-transform .12s ease .17s;
}
.paw-button i {
  position: absolute;
  display: block;
  width: 4px;
  height: 4px;
  top: 50%;
  left: 50%;
  margin: -2px 0 0 -2px;
  opacity: var(--o, 0);
  background: var(--b);
  -webkit-transform: translate(var(--x), var(--y)) scale(var(--s, 1));
          transform: translate(var(--x), var(--y)) scale(var(--s, 1));
}
.paw-button:not(.confetti):hover .text {
  --o: 0;
  --x: 12px;
  --y: 8px;
}
.paw-button:not(.confetti):hover .paws svg.paw {
  --o: 1;
  --x: 0;
}
.paw-button.animation .text {
  --o: 0;
}
.paw-button.animation .text svg {
  --background: var(--heart-background-active);
  --border: var(--heart-border-active);
  --shadow-light: var(--heart-shadow-light);
  --shadow-dark: var(--heart-shadow-dark);
}
.paw-button.animation .paws svg.paw {
  --x: 0;
  --o: 1;
  transition-delay: 0s;
  -webkit-animation: paw .45s ease forwards;
          animation: paw .45s ease forwards;
}
.paw-button.animation .paws svg.paw-clap {
  -webkit-animation: paw-clap .5s ease-in forwards;
          animation: paw-clap .5s ease-in forwards;
}
.paw-button.animation .paws .paw-effect {
  --s: 1;
  --o: 0;
}
.paw-button.confetti i {
  -webkit-animation: confetti .6s ease-out forwards;
          animation: confetti .6s ease-out forwards;
}
.paw-button.confetti .paws svg.paw {
  --o: 0;
  transition: opacity .15s linear .2s;
}
.paw-button.liked {
  --background: var(--background-active);
  --border: var(--border-active);
}
.paw-button.liked .text {
  --w: 21px;
}
.paw-button.liked .text svg {
  --o: 1;
}
.paw-button.liked > span {
  --number: var(--number-active);
}

@-webkit-keyframes confetti {
  from {
    -webkit-transform: translate(0, 0);
            transform: translate(0, 0);
    opacity: 1;
  }
}

@keyframes confetti {
  from {
    -webkit-transform: translate(0, 0);
            transform: translate(0, 0);
    opacity: 1;
  }
}
@-webkit-keyframes paw {
  0% {
    -webkit-transform: translateX(var(--x));
            transform: translateX(var(--x));
  }
  35% {
    -webkit-transform: translateX(-16px);
            transform: translateX(-16px);
  }
  55%,
    70% {
    -webkit-transform: translateX(0);
            transform: translateX(0);
  }
  100% {
    -webkit-transform: translateX(-12px);
            transform: translateX(-12px);
  }
}
@keyframes paw {
  0% {
    -webkit-transform: translateX(var(--x));
            transform: translateX(var(--x));
  }
  35% {
    -webkit-transform: translateX(-16px);
            transform: translateX(-16px);
  }
  55%,
    70% {
    -webkit-transform: translateX(0);
            transform: translateX(0);
  }
  100% {
    -webkit-transform: translateX(-12px);
            transform: translateX(-12px);
  }
}
@-webkit-keyframes paw-clap {
  50%,
    70% {
    -webkit-transform: translate(0, 0);
            transform: translate(0, 0);
  }
}
@keyframes paw-clap {
  50%,
    70% {
    -webkit-transform: translate(0, 0);
            transform: translate(0, 0);
  }
}
html {
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
}

* {
  box-sizing: inherit;
}
*:before, *:after {
  box-sizing: inherit;
}

body {
  min-height: 100vh;
  display: flex;
  font-family: 'Roboto', Arial;
  justify-content: center;
  align-items: center;
  background: #2c2c2c;
}

JavaScript

let confettiAmount = 60,
    confettiColors = [
        '#7d32f5',
        '#f6e434',
        '#63fdf1',
        '#e672da',
        '#295dfe',
        '#6e57ff'
    ],
    random = (min, max) => {
        return Math.floor(Math.random() * (max - min + 1) + min);
    },
    createConfetti = to => {
        let elem = document.createElement('i'),
            set = Math.random() < 0.5 ? -1 : 1;
        elem.style.setProperty('--x', random(-260, 260) + 'px');
        elem.style.setProperty('--y', random(-160, 160) + 'px');
        elem.style.setProperty('--r', random(0, 360) + 'deg');
        elem.style.setProperty('--s', random(.6, 1));
        elem.style.setProperty('--b', confettiColors[random(0, 5)]);
        to.appendChild(elem);
    };

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