pre {
    background: #1e1e1e;
    color: #d4d4d4;
    padding: 1em 1.2em;
    border-radius: 6px;
    overflow-x: auto;
    line-height: 1.5;
  }
  code {
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 0.9em;
  }
  pre code {
    background: none;
    padding: 0;
  }
.catalogue h1:first-of-type {
  position: fixed;
  top: 20px;
  left: 0;
  right: 0;
  width: 500px;
  margin: 0 auto;
  padding: 10px;
  background: linear-gradient(135deg, #a0d8ef 30%, #e8f4f8 50%, #ffffff 70%, #e8f4f8 95%);
  border-radius: 12px;
  transform: translateX(30px);
}

.catalogue {
  position: fixed;
  top: 0;
  width: 0px;
  margin: 0 auto;
  padding: 10px;
}
p:nth-of-type(1) {
  margin-top: 120px;
}