.freq-slider {
    appearance: none;
    width: 120px;
    height: 10px;
    background: transparent;
}

.freq-slider::-webkit-slider-thumb {
    appearance: none;
    width: 16px;
    height: 16px;
    background: black;
    border-radius: 50%;
    cursor: pointer;
    margin-top: -7x;
    margin-left: -7px;
}

.freq-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: black;
    border-radius: 50%;
    cursor: pointer;
}

.freq-slider::-webkit-slider-runnable-track {
    height: 2px;
    background: black;
    }

.freq-slider::-moz-range-track {
    height: 2px;
    background: black;
}