Code Playground

@charset "UTF-8";
@import url(https://fonts.googleapis.com/css?family=Nunito+Sans:300,400,600,700,800);
*,
:after,
:before {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}
:root {
  --c1: #e4491c;
  --c2: #003246;
  --c3: #fef0d6;
}

body {
  height: 100vh;
  margin: 0;
  background: 
  /* Group Four */ radial-gradient(
      circle at 165px 165px,
      var(--c2) 20px,
      transparent 21px
    ),
    radial-gradient(circle at 195px 165px, var(--c3) 20px, transparent 21px),
    radial-gradient(circle at 165px 195px, var(--c3) 20px, transparent 21px),
    radial-gradient(circle at 135px 165px, var(--c3) 20px, transparent 21px),
    radial-gradient(circle at 165px 135px, var(--c3) 20px, transparent 21px),
    /* Group Three */
      radial-gradient(circle at 55px 165px, var(--c3) 24px, transparent 25px),
    radial-gradient(circle at 81px 139px, var(--c2) 24px, transparent 25px),
    radial-gradient(circle at 81px 191px, var(--c2) 24px, transparent 25px),
    radial-gradient(circle at 29px 191px, var(--c2) 24px, transparent 25px),
    radial-gradient(circle at 29px 139px, var(--c2) 24px, transparent 25px),
    /* Group Two */
      radial-gradient(circle at 165px 55px, var(--c3) 24px, transparent 25px),
    radial-gradient(circle at 191px 29px, var(--c2) 24px, transparent 25px),
    radial-gradient(circle at 191px 81px, var(--c2) 24px, transparent 25px),
    radial-gradient(circle at 139px 81px, var(--c2) 24px, transparent 25px),
    radial-gradient(circle at 139px 29px, var(--c2) 24px, transparent 25px),
    /* Group One */
      radial-gradient(circle at 55px 55px, var(--c2) 20px, transparent 21px),
    radial-gradient(circle at 85px 55px, var(--c3) 20px, transparent 21px),
    radial-gradient(circle at 55px 85px, var(--c3) 20px, transparent 21px),
    radial-gradient(circle at 25px 55px, var(--c3) 20px, transparent 21px),
    radial-gradient(circle at 55px 25px, var(--c3) 20px, transparent 21px);

background-color: var(--c1);
  background-size: 220px 220px;
}

body::before {
  content: "Click on the pattern to change its color palette";
  display: block;
  background-color: white;
  position: absolute;
  bottom: 0;
  left: 0;
  font-size: 1.128rem;
  padding: 0.5rem 1rem;
}

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