language-tabs.css

.gatsby-highlight {
  position: relative;
  -webkit-overflow-scrolling: touch;
}

.gatsby-highlight pre .line-number-style {
  margin-right: 12px;
}
.gatsby-highlight pre[class*='language-'] {
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  padding: 1rem 0.75rem;
  border-radius: 0.25rem;
}
.gatsby-highlight pre[class*='language-']::before {
  background: black;
  border-radius: 0 0 0.25rem 0.25rem;
  color: white;
  font-size: 12px;
  letter-spacing: 0.025rem;
  padding: 0.1rem 0.5rem;
  position: absolute;
  right: 1rem;
  text-align: right;
  text-transform: uppercase;
  top: 13px;
}
.gatsby-highlight pre[class~='language-javascript']::before {
  content: 'js';
  background: #f7df1e;
  color: black;
}
.gatsby-highlight pre[class~='language-js']::before {
  content: 'js';
  background: #f7df1e;
  color: black;
}

.gatsby-highlight pre[class~='language-html']::before {
  content: 'html';
  background: #005a9c;
  color: white;
}

.gatsby-highlight pre[class~='language-css']::before {
  content: 'css';
  background: #ff9800;
  color: white;
}

pre::-webkit-scrollbar {
  width: 12px; /* width of the entire scrollbar */
}
pre::-webkit-scrollbar-track {
  background: orange; /* color of the tracking area */
}
pre::-webkit-scrollbar-thumb {
  background-color: #e48b25ef; /* color of the scroll thumb */
  border-radius: 20px; /* roundness of the scroll thumb */
  border: 3px solid rgba(255, 123, 0, 0.863); /* creates padding around scroll thumb */
}