picocss/docs/scss/layout/_aside.scss

/**
 * Docs: Aside
 */

main > aside {
  nav {
    width: 100%;
    margin-bottom: var(--block-spacing-vertical);

    h1 {
      margin-bottom: calc(var(--typography-spacing-vertical) / 2);
    }

    @media (min-width: map-get($breakpoints, "lg")) {
      position: fixed;
      width: 200px;
      max-height: calc(100vh - 5.5rem);
      margin-bottom: 0;
      overflow-x: hidden;
      overflow-y: auto;

      h1 {
        display: none;
      }
    }
  }

  li,
  summary {
    padding-top: 0;
    padding-bottom: 0;
    font-size: 16px;
  }

  li a {
    padding: 0.25rem 0.5rem;

    svg {
      vertical-align: middle;
    }
  }

  a.secondary:focus {
    background-color: transparent;
    color: var(--primary-hover);
  }

  a.active,
  a.active:hover {
    color: var(--primary);
  }

  details {
    padding-bottom: 0.25rem;
    border-bottom: none;

    summary {
      color: var(--h1-color);
      font-size: 14px;
      font-weight: 300;
      text-transform: uppercase;

      &::after {
        display: none;
      }
    }

    &[open] {
      > summary:not(:focus) {
        color: var(--h1-color);
      }
    }
  }
}