.dual-img-container {
    position: relative;
    display: inline-block;
    overflow: hidden;

    font-size: small;
}

.dual-img-container img:first-child {
    position: relative;
}

.dual-img-container img {
    position: absolute;
    top: 0;
    left: 0;
    margin: 0;
}

.dual-img-left-label, .dual-img-right-label {
    white-space: nowrap;
    position: absolute;
    
    line-height: 0;
    bottom: -0.75em;

    color: white;
    text-shadow: 1px 1px 2px black;

    pointer-events: none;
}

.dual-img-aligner {
    display: flex;
    justify-content: center;
    align-items: center;
    
    margin-bottom: var(--content-gap);
}

.dual-img-slider {
    --w: 3px;
    
    height: 100%; 
    flex: 1;
    margin: 0;
    appearance: none;
    background: none;

    width: calc(100% + var(--w)*4);
    cursor: pointer;

    position: absolute;
    top: 0;
    left: calc(var(--w)*-2);
    margin: 0;

    -webkit-appearance: none;
}

.dual-img-slider::-webkit-slider-runnable-track {
    height: 100%;
}

.dual-img-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 100% !important;
    width: calc(var(--w) + 2px) !important;
    border: 1px gray solid;
    background-color: #eeeeee;
    border-radius: 2px !important;
    appearance: none;
}

.dual-img-slider::-moz-range-thumb {
    height: 100%;
    width: var(--w);
    border: 1px gray solid;
    background-color: #eeeeee;
    border-radius: 2px !important;
    appearance: none;
}