devdocs/assets/stylesheets/pages/_fastapi.scss

._fastapi {
  > h2 { @extend %block-heading; }
  > h3 { @extend %block-label, %label-blue; }

  code { @extend %label; }

  .tabbed-block {
    border: 1px dashed black;
    padding: 0.5rem 1rem 0;
    margin-bottom: 1rem;
  }
  .tabbed-block label {
    font-weight: var(--bolderFontWeight);
  }

  .admonition { @extend %note; }
  .admonition.tip { @extend %note-green; }
  .admonition.note { @extend %note-blue; }
  .admonition-title {
    font-weight: var(--bolderFontWeight);
  }
}