home-assistant.io/sass/homeassistant/base/_sidebar.scss

.aside-module {
  .title {
    border-bottom: 1px solid $blue;
    color: $grayDark;
    margin: 1em 0 0.5em;
    padding-bottom: 5px;

    .btn {
      border-bottom-left-radius: 0;
      border-bottom-right-radius: 0;
      padding: 5px 10px;
      text-decoration: none;
    }
  }

  .loading {
    display: block;
    font-size: 2em;
    text-align: center;
  }
}

#sidebar, #left-sidebar, #toc-bar, #integration-sidebar {
  position: sticky;
  top: 88px;
  max-height: calc(100vh - 104px);
  overflow-y: auto;
  scrollbar-width: none;
  border-radius: 16px;

  .aside-module:last-child {
    margin-bottom: 0;
  }

  .grid {
    position: fixed;
    width: 350px;
    display: contents;
    .brand-logo-container {
      margin-top: 16px;
    }
  }
}

@media only screen and (max-width: $lap-end) {
  #sidebar, #left-sidebar, #toc-bar, #integration-sidebar {
    max-height: fit-content;
    
    .grid {
      position: initial;
      width: 100%;
    }
  }
  .site-header {
    .pull-right {
      position: fixed;
    }
  }
  .hero {
    > .grid-wrapper {
      z-index: 0;
    }

    img {
      margin-bottom: 8px;
    }
  }
}