zola/docs/sass/_docs.scss

.documentation {
  padding: 3rem;
  display: flex;

  &__sidebar {
    margin-right: 2rem;

    ul {
      padding-left: 0;
      list-style: none;

      ul {
        padding-left: 1rem;

        li.active a {
          color: red;
        }
      }
    }
  }

  &__content {
    flex: 1;
  }

  a {
    color: $background;
    padding-bottom: 2px;
    border-bottom: 1px solid $background;

    &:hover {
      text-decoration: none;
    }

    &:visited {
      color: $background;
    }
  }

  iframe {
    width: 100%;
    min-height: 400px;
  }
}