*{
    margin: 0;
    padding: 0;
}
body {
    background: #333;
    display: flex;
    width: 100%;
    height: 100vh;
    justify-content: center;
    align-items: center;
}
.main {
    width: 25vw;
    height: 25vw;
    position: absolute;
    display: flex;
    justify-content: start;
    align-items: center;
}
input[type="range"]{
    --c:#1e90ff;
    width: 25vw;
    height: 1vw;
    position: absolute;
    transform: translateY(18vw);
    appearance: none;
    background: linear-gradient(var(--c),var(--c)) no-repeat, black;
    background-size: 0 100%;
    border-radius: 0.5vw;
}
input[type="range"]::-webkit-slider-thumb{
    appearance: none;
    width: 2vw;
    height: 2vw;
    background: var(--c);
    border-radius: 50%;
    box-shadow: 0 0 1vw white, 0 02vw white;
}
#pc {
    color: white;
    font-size: 8vw;
    font-family: Arial, Helvetica, sans-serif;
    text-shadow: 0.2vw 0.2vw 0 gray, 0 0 1vw #1e90ff, 0 0 2vw #1e90ff,0 0 4vw #1e90ff;
}
.main span {
    --bg: black;
    --sg: transparent;
    position: absolute;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: start;

}
.main span::after {
    content: "";
    width: 0.5vw;
    height: 2vw;
    position: absolute;
    background: var(--bg);
    box-shadow: 0 0 0.5vw var(--sg), 0 0 1vw var(--sg), 0 0 2vw var(--sg);
    transition: 0.8s linear;
}