main.css

.sr-only {
    position: absolute;
    top: -30em;
}

table.sortable td,
table.sortable th {
    padding: 0.125em 0.25em;
    width: 8em;
}

table.sortable th {
    font-weight: bold;
    border-bottom: thin solid #888;
    position: relative;
}

table.sortable th.no-sort {
    padding-top: 0.35em;
}

table.sortable th:nth-child(5) {
    width: 10em;
}

table.sortable th button {
    position: absolute;
    padding: 4px;
    margin: 1px;
    font-size: 100%;
    font-weight: bold;
    background: transparent;
    border: none;
    display: inline;
    right: 0;
    left: 0;
    top: 0;
    bottom: 0;
    width: 100%;
    text-align: left;
    outline: none;
    cursor: pointer;
}

table.sortable th button span {
    position: absolute;
    right: 4px;
}

table.sortable th[aria-sort="descending"] span::after {
    /* content: "▼"; */
    color: currentcolor;
    font-size: 100%;
    top: 0;
}

table.sortable th[aria-sort="ascending"] span::after {
    /* content: "▲"; */
    color: currentcolor;
    font-size: 100%;
    top: 0;
}

table.show-unsorted-icon th:not([aria-sort]) button span::after {
    content: "♢";
    color: currentcolor;
    font-size: 100%;
    position: relative;
    top: -3px;
    left: -4px;
}

table.sortable td.num {
    text-align: right;
}

table.sortable tbody tr:nth-child(odd) {
    background-color: #ddd;
}

/* Focus and hover styling */

table.sortable th button:focus,
table.sortable th button:hover {
    padding: 2px;
    border: 2px solid currentcolor;
    background-color: #e5f4ff;
}

table.sortable th button:focus span,
table.sortable th button:hover span {
    right: 2px;
}

table.sortable th:not([aria-sort]) button:focus span::after,
table.sortable th:not([aria-sort]) button:hover span::after {
    /* content: "▼"; */
    color: currentcolor;
    font-size: 100%;
    top: 0;
}

.tooltip {
    position: relative;
    display: inline-block;
    border-bottom: 1px dotted black;
  }
  
  .tooltip .tooltiptext {
    visibility: hidden;
    width: 120px;
    background-color: #555;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 5px 0;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -60px;
    opacity: 0;
    transition: opacity 0.3s;
  }
  
  .tooltip .tooltiptext::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: #555 transparent transparent transparent;
  }
  
  .tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
  }