.visor-bar {
    position: absolute;
    top: 0;
    left: 0;
    background: white;
    pointer-events: none;
}

.visor-bar.horizontal {
    width: 1px;
    height: 100%;
}
.visor-bar.vertical {
    width: 100%;
    height: 1px;
}

.visor-bar-legend {
    position: absolute;
    top: 0;
    left: 0;
    margin: 2px;
    padding: 2px;
    background: rgba(0, 0, 0, 0.75);
    color: white;
    font-size: 12px;
    white-space: nowrap;
    border-radius: 3px;
}

.horizontal .visor-bar-legend {
    transform: translateX(-50%);
}
.vertical .visor-bar-legend {
    transform: translateY(-50%);
}