video_player/src/DefaultPlayer/Seek/Seek.css

.component {
    position: relative;
}

.track {
    position: absolute;
    top: 50%;
    left: 5px;
    right: 5px;
    height: 4px;
    transform: translateY(-50%);
    background-color: #3e3e3e;
}

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

.buffer {
    background-color: #5a5a5a;
}

.fill {
    background: #fff;
}

.input {
    width: 100%;
    opacity: 0;
    cursor: pointer;
}