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HTML

<div class="content">
    <h1>Gradient Card</h1>
    <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Ipsum tempore unde ex pariatur distinctio laboriosam, dolorem quibusdam aperiam expedita consequuntur dolorum porro vitae earum quos voluptates et maxime. Tempora, mollitia.</p>
  </div>
</div>
<div class="gradient-bg">
  <svg 
       viewBox="0 0 100vw 100vw"
       xmlns='http://www.w3.org/2000/svg'
       class="noiseBg"
       >
    <filter id='noiseFilterBg'>
      <feTurbulence 
                    type='fractalNoise'
                    baseFrequency='0.6'
                    stitchTiles='stitch' />
    </filter>

CSS

@import url('https://fonts.googleapis.com/css?family=Montserrat:400,700');

:root {
  --color-bg1: rgb(28, 30, 35);
  --color-bg2: rgb(10, 27, 52);
  --color1: 255, 83, 73;
  --color2: 255, 162, 91;
  --color3: 73, 194, 144;
  --color4: 60, 180, 255;
  --color5: 102, 51, 153;
  --color-interactive: 255, 198, 73;
  --circle-size: 80%;
  --blending: hard-light;
}

* {
  margin: 0;
  padding: 0;
  outline: none;
  list-style: none;
  text-decoration: none;
  box-sizing: border-box;
  color: #FFF;
  background: transparent;
  border: none;
}

html, body {
  font-family: 'Dongle', sans-serif;
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
}

body {
  background: #FFF;
  font-family: 'Montserrat', sans-serif;
  overflow: hidden;
}

h1, h2, h3 {
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
}

.card {
  position: absolute;
  z-index: 10;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  user-select: none;
  max-width: 600px;
  padding: 48px;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-radius: 8px;
  box-shadow: 0 4px 90px rgba(0, 0, 0, 0.1);
  overflow: hidden;
}

.card:before {
  content: "";
  position: absolute;
  z-index: 2;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 1) 34%, rgba(255, 255, 255, 1) 89%, rgba(255, 255, 255, 0) 100%);
  opacity: 0.3;
  filter: blur(0.5px);
  mix-blend-mode: hard-light;
}

.card .noise {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  z-index: 1;
  opacity: 0.1;
}

.card .content {
  position: relative;
  z-index: 2;
  text-shadow: -3px 0px 2px rgba(0, 0, 0, 0.1);
}

h1 {
  font-size: 3rem;
  margin-bottom: 16px;
}

p {
  line-height: 1.6;
}

@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(45deg, var(--color-bg1) 30%, var(--color-bg2) 100%);
  top: 0;
  left: 0;
}

.gradient-bg .svgBlur {
  display: none;
}

.gradient-bg .noiseBg {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  z-index: 1;
  mix-blend-mode: soft-light;
  opacity: 0.3;
}

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

.gradient-bg .g1 {
  position: absolute;
  background: radial-gradient(circle at center, rgba(var(--color1), 0.8) 0, rgba(var(--color1), 0) 50%) 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);
  animation: moveVertical 30s ease infinite;
  opacity: 1;
}

.gradient-bg .g2 {
  position: absolute;
  background: radial-gradient(circle at center, rgba(var(--color2), 0.8) 0, rgba(var(--color2), 0) 50%) 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);
  animation: moveInCircle 20s reverse infinite;
  opacity: 1;
}

.gradient-bg .g3 {
  position: absolute;
  background: radial-gradient(circle at center, rgba(var(--color3), 0.8) 0, rgba(var(--color3), 0) 50%) 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);
  animation: moveInCircle 40s linear infinite;
  opacity: 1;
}

.gradient-bg .g4 {
  position: absolute;
  background: radial-gradient(circle at center, rgba(var(--color4), 0.8) 0, rgba(var(--color4), 0) 50%) 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);
  animation: moveHorizontal 40s ease infinite;
  opacity: 0.7;
}

.gradient-bg .g5 {
  position: absolute;
  background: radial-gradient(circle at center, rgba(var(--color5), 0.8) 0, rgba(var(--color5), 0) 50%) 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));
  animation: moveInCircle 20s ease infinite;
  opacity: 1;
}

.gradient-bg .interactive {
  position: absolute;
  background: radial-gradient(circle at center, rgba(var(--color-interactive), 0.8) 0, rgba(var(--color-interactive), 0) 50%) no-repeat;
  mix-blend-mode: var(--blending);
  width: 100%;
  height: 100%;
  top: -50%;
  left: -50%;
  opacity: 0.7;
}