Source/WebCore/Modules/modern-media-controls/controls/slider.css

/*
 * Copyright (C) 2016 Apple Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

.slider {
    position: absolute;
    height: 3px;
    background-color: rgba(255, 255, 255, 0.185);
    border-radius: 1.5px;
}

.slider > input,
.slider > .fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
}

.slider > .fill {
    border-radius: 1.5px 0 0 1.5px;
    background-color: rgba(255, 255, 255, 0.255);
    pointer-events: none;
}

.slider > input {
    -webkit-appearance: none !important;
    background-color: transparent;
    width: 100%;
    border-radius: 1.5px;
    margin: 0;
}

.slider > input::-webkit-slider-thumb {
    -webkit-appearance: none !important;
    background-color: rgb(179, 179, 179);
    box-shadow: 0px 0px 0px 1px rgb(40, 40, 40);
}