styles.css

body {
    max-width: 1200px;
  }
  
  .page header {
    border: #005a9c solid 2px;
    background: #005a9c;
    color: white;
    text-align: center;
  }
  
  .page header .title {
    font-size: 2.5em;
    font-weight: bold;
    font-family: serif;
  }
  
  .page header .tagline {
    font-style: italic;
  }
  
  .page footer {
    border: #005a9c solid 2px;
    background: #005a9c;
    font-family: serif;
    color: white;
    font-style: italic;
    padding-left: 1em;
  }
  
  .page .body {
    display: grid;
    grid-template-columns: auto auto;
    border: #eee solid 2px;
  }
  
  .page .body nav {
    margin: 0;
    padding: 6px;
    width: 25em;
    height: 60em;
    background: #eee;
  }
  
  .page .body nav.focus {
    padding: 4px;
    border: 2px solid #005a9c;
  }
  
  .page .body .page {
    margin: 0.25em;
    padding: 0.25em;
    height: 30em;
  }
  
  .page .body .page h1 {
    margin: 0;
    padding: 0;
  }
  
  .page .main {
    padding: 1em;
  }
  
  .treeview-navigation ul,
  .treeview-navigation li {
    margin: 0;
    padding: 0;
  }
  
  li:not(:has(ul)){
    margin-left: 1.15em !important;
  }
  
  .treeview-navigation li li span.label {
    padding-left: 1em;
  }
  
  .treeview-navigation li li li span.label {
    padding-left: 2em;
  }
  
  .treeview-navigation[role="tree"] {
    margin: 0;
    padding: 0;
    list-style: none;
  }
  
  .treeview-navigation[role="tree"] li {
    margin: 0;
    padding: 0;
    list-style: none;
  }
  
  .treeview-navigation a[role="treeitem"] ul {
    margin: 0;
    padding: 0;
  }
  
  .treeview-navigation
    a[role="treeitem"][aria-expanded="false"] + navigation-list > [role="group"] {
    display: none;
  }
  
  .treeview-navigation a[role="treeitem"][aria-expanded="true"] + navigation-list > [role="group"] {
    display: block;
  }
  
  .treeview-navigation a[role="treeitem"] > span svg {
    transform: translate(0, 0);
  }
  
  .treeview-navigation a[role="treeitem"][aria-expanded="false"] > span svg {
    transform: rotate(270deg) translate(2px, 2px);
  }
  
  .treeview-navigation a[role="treeitem"] {
    margin: 0;
    padding: 4px;
    padding-left: 9px;
    text-decoration: none;
    color: #005a9c;
    border: none;
    display: block;
  }
  
  .treeview-navigation a[role="treeitem"][aria-current] {
    border-left: 5px solid #005a9c;
    padding-left: 4px;
    background-color: #ddd;
  }
  
  .treeview-navigation a[role="treeitem"] span.icon svg polygon {
    stroke-width: 2px;
    fill: currentcolor;
    stroke: transparent;
  }
  
  /* disable default keyboard focus styling for treeitems
     Keyboard focus is styled with the following CSS */
  
  .treeview-navigation a[role="treeitem"]:focus {
    outline: 0;
    padding: 2px;
    padding-left: 7px;
    border: 2px #005a9c solid;
  }
  
  .treeview-navigation a[role="treeitem"][aria-current]:focus {
    padding-left: 4px;
    border-left-width: 5px;
  }
  
  .treeview-navigation a[role="treeitem"]:hover {
    background-color: #adddff;
    text-decoration: underline;
    padding-left: 4px;
    border-left: 5px solid #333;
  }
  
  .treeview-navigation a[role="treeitem"] span.icon:hover {
    color: #333;
  }
  
  .treeview-navigation a[role="treeitem"] span.icon svg polygon:hover {
    stroke: currentcolor;
  }