CSS3 Animated Gradient Background (Snippet)

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HTML Code

<div class="gradient-bg">
    <div class="gradients-container">
      <div class="g1"></div>
      <div class="g2"></div>
      <div class="g3"></div>
      <div class="g4"></div>
      <div class="g5"></div>
      <div class="interactive"></div>
    </div>
  </div>

CSS Code

html, body {
  margin: 0;
  padding: 0;
}

:root {
  --color-bg1: rgb(108, 0, 162);
  --color-bg2: rgb(0, 17, 82);
  --color1: 18, 113, 255;
  --color2: 221, 74, 255;
  --color3: 100, 220, 255;
  --color4: 200, 50, 50;
  --color5: 180, 180, 50;
  --color-interactive: 140, 100, 255;
  --circle-size: 80%;
  --blending: hard-light;
}

@keyframes moveInCircle {
  0% {
    transform: rotate(0deg);
  }
  50% {
    transform: rotate(180deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

@keyframes moveVertical {
  0% {
    transform: translateY(-50%);
  }
  50% {
    transform: translateY(50%);
  }
  100% {
    transform: translateY(-50%);
  }
}

@keyframes moveHorizontal {
  0% {
    transform: translateX(-50%) translateY(-10%);
  }
  50% {
    transform: translateX(50%) translateY(10%);
  }
  100% {
    transform: translateX(-50%) translateY(-10%);
  }
}


.gradient-bg {
  width: 100vw;
  height: 100vh;
  position: relative;
  overflow: hidden;
  background: linear-gradient(40deg, var(--color-bg1), var(--color-bg2));
  top: 0;
  left: 0;


  .gradients-container {
    filter: url(#goo) blur(40px) ;
    width: 100%;
    height: 100%;
  }

  .g1 {
    position: absolute;
    background: radial-gradient(circle at center, rgba(var(--color1), 0.8) 0, rgba(var(--color1), 0) 40%) no-repeat;
    mix-blend-mode: var(--blending);

width: var(--circle-size);
height: var(--circle-size);
top: calc(50% - var(--circle-size) / 2);
left: calc(50% - var(--circle-size) / 2);

transform-origin: center center;
animation: moveVertical 30s ease infinite;

opacity: 1;
  }

  .g2 {
    position: absolute;
    background: radial-gradient(circle at center, rgba(var(--color2), 0.8) 0, rgba(var(--color2), 0) 40%) no-repeat;
    mix-blend-mode: var(--blending);

width: var(--circle-size);
height: var(--circle-size);
top: calc(50% - var(--circle-size) / 2);
left: calc(50% - var(--circle-size) / 2);

transform-origin: calc(50% - 400px);
animation: moveInCircle 20s reverse infinite;

opacity: 1;
  }

  .g3 {
    position: absolute;
    background: radial-gradient(circle at center, rgba(var(--color3), 0.8) 0, rgba(var(--color3), 0) 40%) no-repeat;
    mix-blend-mode: var(--blending);

width: var(--circle-size);
height: var(--circle-size);
top: calc(50% - var(--circle-size) / 2 + 200px);
left: calc(50% - var(--circle-size) / 2 - 500px);

transform-origin: calc(50% + 400px);
animation: moveInCircle 40s linear infinite;

opacity: 1;
  }

  .g4 {
    position: absolute;
    background: radial-gradient(circle at center, rgba(var(--color4), 0.8) 0, rgba(var(--color4), 0) 40%) no-repeat;
    mix-blend-mode: var(--blending);

width: var(--circle-size);
height: var(--circle-size);
top: calc(50% - var(--circle-size) / 2);
left: calc(50% - var(--circle-size) / 2);

transform-origin: calc(50% - 200px);
animation: moveHorizontal 40s ease infinite;

opacity: 0.7;
  }

  .g5 {
    position: absolute;
    background: radial-gradient(circle at center, rgba(var(--color5), 0.8) 0, rgba(var(--color5), 0) 40%) no-repeat;
    mix-blend-mode: var(--blending);

width: calc(var(--circle-size) * 2);
height: calc(var(--circle-size) * 2);
top: calc(50% - var(--circle-size));
left: calc(50% - var(--circle-size));

transform-origin: calc(50% - 800px) calc(50% + 200px);
animation: moveInCircle 20s ease infinite;

opacity: 1;
  }

  .interactive {
    position: absolute;
    background: radial-gradient(circle at center, rgba(var(--color-interactive), 0.8) 0, rgba(var(--color-interactive), 0) 40%) no-repeat;
    mix-blend-mode: var(--blending);

width: 100%;
height: 100%;
top: -50%;
left: -50%;

opacity: 0.7;
  }
}

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