SVG CSS背景动画

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html

css

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html

<div class="arrow arrow--top">
    <svg xmlns="http://www.w3.org/2000/svg" width="270.11" height="649.9" overflow="visible">
      <style>
        .geo-arrow {
          fill: none;
          stroke: #fff;
          stroke-width: 2;
          stroke-miterlimit: 10
        }
      </style>
      <g class="item-to bounce-1">
        <path class="geo-arrow draw-in" d="M135.06 142.564L267.995 275.5 135.06 408.434 2.125 275.499z" />
      </g>
      <circle class="geo-arrow item-to bounce-2" cx="194.65" cy="69.54" r="7.96" />
      <circle class="geo-arrow draw-in" cx="194.65" cy="39.5" r="7.96" />
      <circle class="geo-arrow item-to bounce-3" cx="194.65" cy="9.46" r="7.96" />
      <g class="geo-arrow item-to bounce-2">
        <path class="st0 draw-in" d="M181.21 619.5l13.27 27 13.27-27zM194.48 644.5v-552" />
      </g>
    </svg>
  </div>
  <div class="arrow arrow--bottom">
    <svg xmlns="http://www.w3.org/2000/svg" width="31.35" height="649.9" overflow="visible">
      <style>
        .geo-arrow {
          fill: none;
          stroke: #fff;
          stroke-width: 2;
          stroke-miterlimit: 10
        }
      </style>
      <g class="item-to bounce-1">
        <circle class="geo-arrow item-to bounce-3" cx="15.5" cy="580.36" r="7.96" />
        <circle class="geo-arrow draw-in" cx="15.5" cy="610.4" r="7.96" />
        <circle class="geo-arrow item-to bounce-2" cx="15.5" cy="640.44" r="7.96" />
        <g class="item-to bounce-2">
          <path class="geo-arrow draw-in" d="M28.94 30.4l-13.26-27-13.27 27zM15.68 5.4v552" />
        </g>
      </g>
    </svg>
  </div>
  <div class="main">
    <div class="main__text-wrapper">
    <h1 class="main__title">Transitions & Animations</h1>
    <h2>Combined with SVGs</h2>      
      <svg xmlns="http://www.w3.org/2000/svg" class="dotted-circle" width="352" height="352" overflow="visible">
  <circle cx="176" cy="176" r="174" fill="none" stroke="#fff" stroke-width="2" stroke-miterlimit="10" stroke-dasharray="12.921,11.9271"/>
</svg>
    </div>
  </div>

css

@import url("https://fonts.googleapis.com/css2?family=DM+Mono:ital,wght@0,300;1,500&display=swap");
body {
  background: linear-gradient(#3800e7, #8a15ff);
  height: 100vh;
  font-size: calc(14px + (26 - 14) * ((100vw - 300px) / (1600 - 300)));
  font-family: "DM Mono", monospace;
  font-weight: 300;
  overflow: hidden;
  color: white;
  text-align: center;
}

h1 {
  font-size: 3em;
  margin-bottom: 0.2em;
}

h2 {
  font-size: 2em;
}

.main {
  height: 100vh;
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
  position: relative;
  justify-content: center;
  align-items: center;
}
.main:before, .main:after {
  content: "";
  display: block;
  position: absolute;
  z-index: -3;
}
.main:before {
  right: 0;
  bottom: -19;
  height: 30em;
  width: 30em;
  border-radius: 30em;
  background: linear-gradient(#3800e7, #8a15ff);
  align-self: flex-end;
  -webkit-animation: gradient-fade 8s ease-in-out 3s infinite alternate;
          animation: gradient-fade 8s ease-in-out 3s infinite alternate;
}
.main:after {
  top: 0;
  left: 30;
  height: 10em;
  width: 10em;
  border-radius: 10em;
  background: linear-gradient(#3800e7, #8a15ff);
  -webkit-animation: gradient-fade-alt 6s ease-in-out 3s infinite alternate;
          animation: gradient-fade-alt 6s ease-in-out 3s infinite alternate;
}
.main__text-wrapper {
  position: relative;
  padding: 2em;
}
.main__text-wrapper:before, .main__text-wrapper:after {
  content: "";
  display: block;
  position: absolute;
}
.main__text-wrapper:before {
  z-index: -1;
  top: -3em;
  right: -3em;
  width: 13em;
  height: 13em;
  opacity: 0.7;
  border-radius: 13em;
  background: linear-gradient(#15e0ff, #8a15ff);
  -webkit-animation: rotation 7s linear infinite;
          animation: rotation 7s linear infinite;
}
.main__text-wrapper:after {
  z-index: -1;
  bottom: -20em;
  width: 20em;
  height: 20em;
  border-radius: 20em;
  background: linear-gradient(#d000c5, #8a15ff);
  -webkit-animation: rotation 7s linear infinite;
          animation: rotation 7s linear infinite;
}

.arrow {
  z-index: 1000;
  opacity: 0.5;
  position: absolute;
}
.arrow--top {
  top: 0;
  left: -5em;
}
.arrow--bottom {
  bottom: 0;
  right: 3em;
}

.circle {
  transform: translate(50%, -50%) rotate(0deg);
  transform-origin: center;
}
.circle--ltblue {
  height: 20em;
  width: 20em;
  border-radius: 20em;
  background: linear-gradient(#15e0ff, #3800e7);
}

.backdrop {
  position: absolute;
  width: 100vw;
  height: 100vh;
  display: block;
  background-color: pink;
}

.dotted-circle {
  position: absolute;
  top: 0;
  right: 0;
  opacity: 0.3;
  -webkit-animation: rotation 38s linear infinite;
          animation: rotation 38s linear infinite;
}

.draw-in {
  stroke-dasharray: 1000;
  stroke-dashoffset: 10;
  -webkit-animation: draw 15s ease-in-out alternate infinite;
          animation: draw 15s ease-in-out alternate infinite;
}

@-webkit-keyframes draw {
  from {
    stroke-dashoffset: 1000;
  }
  to {
    stroke-dashoffset: 0;
  }
}

@keyframes draw {
  from {
    stroke-dashoffset: 1000;
  }
  to {
    stroke-dashoffset: 0;
  }
}
.item-to {
  -webkit-animation-duration: 10s;
          animation-duration: 10s;
  -webkit-animation-iteration-count: infinite;
          animation-iteration-count: infinite;
  transform-origin: bottom;
}

.bounce-1 {
  -webkit-animation-name: bounce-1;
          animation-name: bounce-1;
  -webkit-animation-timing-function: ease;
          animation-timing-function: ease;
}

.bounce-2 {
  -webkit-animation-name: bounce-2;
          animation-name: bounce-2;
  -webkit-animation-timing-function: ease;
          animation-timing-function: ease;
}

.bounce-3 {
  -webkit-animation-name: bounce-3;
          animation-name: bounce-3;
  -webkit-animation-timing-function: ease;
          animation-timing-function: ease;
}

@-webkit-keyframes bounce-1 {
  0% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(50px);
  }
  100% {
    transform: translateY(0);
  }
}

@keyframes bounce-1 {
  0% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(50px);
  }
  100% {
    transform: translateY(0);
  }
}
@-webkit-keyframes bounce-2 {
  0% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-30px);
  }
  100% {
    transform: translateY(0);
  }
}
@keyframes bounce-2 {
  0% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-30px);
  }
  100% {
    transform: translateY(0);
  }
}
@-webkit-keyframes bounce-3 {
  0% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(30px);
  }
  100% {
    transform: translateY(0);
  }
}
@keyframes bounce-3 {
  0% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(30px);
  }
  100% {
    transform: translateY(0);
  }
}
@-webkit-keyframes rotation {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}
@keyframes rotation {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}
@-webkit-keyframes gradient-fade {
  from {
    transform: translate(10%, -10%) rotate(0deg);
  }
  to {
    transform: translate(50%, -50%) rotate(360deg);
  }
}
@keyframes gradient-fade {
  from {
    transform: translate(10%, -10%) rotate(0deg);
  }
  to {
    transform: translate(50%, -50%) rotate(360deg);
  }
}
@-webkit-keyframes gradient-fade-alt {
  from {
    transform: translate(-20%, 20%) rotate(0deg);
  }
  to {
    transform: translate(-60%, 60%) rotate(360deg);
  }
}
@keyframes gradient-fade-alt {
  from {
    transform: translate(-20%, 20%) rotate(0deg);
  }
  to {
    transform: translate(-60%, 60%) rotate(360deg);
  }
}

JavaScript

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