sky.js/sky.controls.css

.skyselect-popup {
    display: none;
    position: absolute;
    min-width: 120px;
    min-height: 8px;

    border: 1px solid black;
    background-color: white;

    z-index: 999;

    overflow-y: auto;
    overflow-x: hidden;
}

.skyselect-item {
    padding: 2px;
    padding-left: 4px;
    padding-right: 4px;
    cursor: pointer;
}
.skyselect-item.selected {
    background-color: blue;
    color: white;
}

.skyselect-item.active {
    background-color: #B0B0B0;
}