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CSS

Cross Browser CSS

Hi guys, I just can't figure out how to make these background colors show also in Firefox (where they are now showing), can somebody please assist me with the right CSS code. I know I have to put -moz-appearance: - but everything I try fails. Here is the code

input[type='range'] {
    -webkit-appearance: none !important;
    background: #000;
    border:grey 1px solid;
    height:4px;
    width: 100%;
}

input[type='range']::-webkit-slider-thumb {
    -webkit-appearance: none !important;
    background: orange;
    height:5px;
    width:15px;
    cursor:pointer;
}