Input by seyed-mohsen-mousavi

1/* level settings 👇 */
2
3.slider {
4  /* slider */
5  --slider-width: 100%;
6  --slider-height: 50px;
7  --slider-bg: rgb(82, 82, 82);
8  --slider-border-radius: 9px;
9  /* level */
10  --level-color: #fff;
11  --level-transition-duration: 0.1s;
12  /* icon */
13  --icon-margin: 15px;
14  --icon-color: var(--slider-bg);
15  --icon-size: 25px;
16}
17
18.slider {
19  position: relative;
20  cursor: pointer;
21  display: -webkit-inline-box;
22  display: -ms-inline-flexbox;
23  display: inline-flex;
24  -webkit-box-orient: horizontal;
25  -webkit-box-direction: reverse;
26  -ms-flex-direction: row-reverse;
27  flex-direction: row-reverse;
28  -webkit-box-align: center;
29  -ms-flex-align: center;
30  align-items: center;
31}
32
33.slider .volume {
34  display: inline-block;
35  vertical-align: top;
36  margin-right: var(--icon-margin);
37  color: var(--icon-color);
38  width: var(--icon-size);
39  height: auto;
40  position: absolute;
41  left: 0;
42  pointer-events: none;
43}
44
45.slider .level {
46  -webkit-appearance: none;
47  -moz-appearance: none;
48  appearance: none;
49  width: var(--slider-width);
50  height: var(--slider-height);
51  background: var(--slider-bg);
52  overflow: hidden;
53  border-radius: var(--slider-border-radius);
54  -webkit-transition: height var(--level-transition-duration);
55  -o-transition: height var(--level-transition-duration);
56  transition: height var(--level-transition-duration);
57  cursor: inherit;
58  transform: rotate(270deg);
59}
60
61.slider .level::-webkit-slider-thumb {
62  -webkit-appearance: none;
63  width: 0;
64  height: 0;
65  -webkit-box-shadow: -200px 0 0 200px var(--level-color);
66  box-shadow: -200px 0 0 200px var(--level-color);
67}
68