table {
    width: 80%;
    border-collapse: collapse;
    border: 1px solid #bdbdbd;
}
thead th {
    position: sticky;
    top: 0;
    height: 50px;
    padding-left: 10px;
    background-color: #505050;
    color: white;
    text-align: left;
    z-index: 1;
    border: 1px solid #000000;
}
td {
    /* padding: -5px; */
    padding-left: 5px;
    padding-top: 0px;
    padding-bottom: 0px;
    text-align: left;
    border: 1px solid #bdbdbd;
}
.collapsible-row {
    display: none;
}
.operator-header-untested {
    cursor: pointer;
    min-height: 30px;
    height: 50px;
    /* border: 1px solid #ddd; */
    background-color: #d5d5d5;
}
.operator-header-success {
    cursor: pointer;
    min-height: 30px;
    height: 50px;
    background-color: #e2e9e4;
    /* border: 2px solid #000000; */
}
.operator-header-failure {
    cursor: pointer;
    min-height: 30px;
    height: 50px;
    background-color: #ddcfcd;
    /* border: 2px solid #000000; */
}
.arrow {
    display: inline-block;
    transition: transform 0.2s;
    margin-right: 6px;
}
.arrow.expanded {
    transform: rotate(180deg); /* flips the ▼ to ▲ */
}