Input by Galahhad

1/* level settings 👇 */
2
3.slider {
4  /* slider */
5  --slider-width: 100%;
6  --slider-height: 6px;
7  --slider-bg: rgb(82, 82, 82);
8  --slider-border-radius: 999px;
9  /* level */
10  --level-color: #fff;
11  --level-transition-duration: .1s;
12  /* icon */
13  --icon-margin: 15px;
14  --icon-color: var(--slider-bg);
15  --icon-size: 25px;
16}
17
18.slider {
19  cursor: pointer;
20  display: -webkit-inline-box;
21  display: -ms-inline-flexbox;
22  display: inline-flex;
23  -webkit-box-orient: horizontal;
24  -webkit-box-direction: reverse;
25  -ms-flex-direction: row-reverse;
26  flex-direction: row-reverse;
27  -webkit-box-align: center;
28  -ms-flex-align: center;
29  align-items: center;
30}
31
32.slider .volume {
33  display: inline-block;
34  vertical-align: top;
35  margin-right: var(--icon-margin);
36  color: var(--icon-color);
37  width: var(--icon-size);
38  height: auto;
39}
40
41.slider .level {
42  -webkit-appearance: none;
43  -moz-appearance: none;
44  appearance: none;
45  width: var(--slider-width);
46  height: var(--slider-height);
47  background: var(--slider-bg);
48  overflow: hidden;
49  border-radius: var(--slider-border-radius);
50  -webkit-transition: height var(--level-transition-duration);
51  -o-transition: height var(--level-transition-duration);
52  transition: height var(--level-transition-duration);
53  cursor: inherit;
54}
55
56.slider .level::-webkit-slider-thumb {
57  -webkit-appearance: none;
58  width: 0;
59  height: 0;
60  -webkit-box-shadow: -200px 0 0 200px var(--level-color);
61  box-shadow: -200px 0 0 200px var(--level-color);
62}
63
64.slider:hover .level {
65  height: calc(var(--slider-height) * 2);
66}