.slider {
    position: relative;
}

.slider > .mainTrack {
    background-color: #dddddd;
    height: 6px;
    top: -3px;
    width: 100%;
    position: absolute;
}
.slider > .middleTrack {
    background-color: #3786c2;
    height: 6px;
    top: -3px;
    left: 0%;
    right: 0%;
    position: absolute;
}

.slider > .handle {
    height: 0;
    width: 100%;
    -webkit-appearance: none;
    -moz-appearance: none;
    pointer-events: none;
    position: absolute;
}
.slider > .handle::-webkit-slider-thumb {
    pointer-events: auto;
}
.slider > .handle::-moz-range-thumb {
    pointer-events: auto;
}
.slider > .handle::-moz-range-thumb:hover {
    background-color: #bbbbbb;
}