body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: linear-gradient(-45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab);
  background-size: 400% 400%;
  animation: gradient 15s ease infinite;
}

.container {
  box-sizing: border-box;
  display: flex;
  justify-content: center;
  align-items: center;
  width: min(90vw, 680px);
  height: 30vh;
  min-height: 420px;
  margin: 15vh auto;
  border-radius: 28px;
}

@keyframes gradient {
  0% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }

  100% {
    background-position: 0% 50%;
  }
}

.box {
  border-radius: 20px;
  width: 60px;
  height: 60px;
  background: #f0f0f0;
  box-shadow: 0 0 0 rgba(15, 23, 42, 0),
    0 0 0 rgba(15, 23, 42, 0),
    10px 10px 14px rgba(15, 23, 42, 0.22) inset,
    -10px -10px 14px rgba(15, 23, 42, 0.08) inset;
  animation: anime 3s cubic-bezier(0.16, 1, 0.3, 1) 1s infinite alternate;
}

@keyframes anime {
  0% {
    width: 60px;
    height: 60px;
    background: #f0f0f0;
    box-shadow: 0 0 0 rgba(15, 23, 42, 0),
      0 0 0 rgba(15, 23, 42, 0),
      10px 10px 14px rgba(15, 23, 42, 0.22) inset,
      -10px -10px 14px rgba(15, 23, 42, 0.08) inset;
  }

  25% {
    width: 60px;
    height: 60px;
    background: #f8f8f8;
    box-shadow: 10px 10px 18px rgba(15, 23, 42, 0.22),
      -10px -10px 18px rgba(15, 23, 42, 0.08),
      0 0 0 rgba(15, 23, 42, 0) inset,
      0 0 0 rgba(15, 23, 42, 0) inset;
  }

  50% {
    width: 60px;
    height: 240px;
    background: #f8f8f8;
    box-shadow: 10px 10px 18px rgba(15, 23, 42, 0.22),
      -10px -10px 18px rgba(15, 23, 42, 0.08),
      0 0 0 rgba(15, 23, 42, 0) inset,
      0 0 0 rgba(15, 23, 42, 0) inset;
  }

  100% {
    width: 480px;
    height: 240px;
    background: #fafafa;
    box-shadow: 40px 40px 48px rgba(15, 23, 42, 0.24),
      -8px -8px 24px rgba(15, 23, 42, 0.08),
      0 0 0 rgba(15, 23, 42, 0) inset,
      2px 2px 2px rgba(15, 23, 42, 0.08) inset;
  }
}

.code-panel {
  padding: 32px;
  background: #ffffff;
  color: #17202c;
}

.code-panel h1 {
  margin: 0 0 16px;
  font-size: 24px;
}

.code-panel pre {
  margin: 0;
  overflow: auto;
  padding: 18px;
  border-radius: 12px;
  background: #17202c;
  color: #f7fafc;
  font-size: 14px;
  line-height: 1.55;
}