style.css

* {
    margin: 0;
    padding: 0;
    user-select: none;
    box-sizing: border-box;
}

body {
    background: black;
}

:root {
    --blade-lightness: 50%;
}

.randomColorBtn {
    position: absolute;
    bottom: 0;
    cursor: pointer;
    text-align: center;
    outline: none;
    margin-top: 50px;
    width: 350px;
    border-radius: 35px;
    height: 70px;
    font-size: 35px;
    color: white;
    font-weight: bold;
    background: black;
    border: white 5px solid;
}

.randomColorBtn:hover {
    background: white;
    color: black;
}

.content {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    text-align: center ;
}

.content h2 {
    visibility: hidden;
    position: absolute;
    color: white;
    letter-spacing: 3.5px;
    font-size: 50px;
    -webkit-box-reflect: below 1px linear-gradient(transparent, #0004);
}

.active {
    visibility: visible;
}

.lightsaber {
    margin-top: 50vh;
    grid-column: 1 / -1;
    position: relative;
    transform: rotate(90deg);
}

/* #lightsaber2 {
    transform: rotate(180deg);
} */
  
#on-off, #on-off2 {
    position: absolute;
    width: 0;
    height: 0;
}

.lightsaber2 {
    transform: rotate(180deg);
}

/* Рукоятка */

.handle {
    cursor: pointer;
    display: block;
    width: 14px;
    height: 125px;
    border-radius: 0 0 4px 4px;
    background-image: linear-gradient(
      silver 0 10px,
      orange 0 14px,
      silver 0 15px,
      black 0 20px,
      silver 0 22px,
      black 0 25px,
      silver 0 27px,
      black 0 30px,
      silver 0 32px,
      black 0 35px,
      silver 0 37px,
      black 0 40px,
      silver 0 42px,
      black 0 45px,
      silver 0 47px,
      black 0 50px,
      silver 0 60px,
      orange 60px 100px,
      silver 50px 100%
    );
}

/* Лезвие */
  
.blade, .blade2 {
    position: absolute;
    background: white;
    height: 350%;
    width: 100%;
    bottom: 100%;
    border-radius: 1vw 100vw 0 0;
    box-shadow: inset 0 0 4px
    hsl(var(--blade-color) 100% var(--blade-lightness) / 1),
    0 0 1em hsl(var(--blade-color) 100% var(--blade-lightness) / 0.8),
    0 0 1.5em hsl(var(--blade-color) 100% var(--blade-lightness) / 0.7),
    0 0 2em hsl(var(--blade-color) 100% var(--blade-lightness) / 0.5),
    0 0 3em hsl(var(--blade-color) 100% var(--blade-lightness) / 0.3),
    0 0 5em hsl(var(--blade-color) 100% var(--blade-lightness) / 0.2);
    transition: transform 100ms ease-out;
    transform-origin: bottom;
    transition: 0.5s;
}
  
.blade::before, .blade2::before {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    right: 0;
    left: 0;
    background: white;
    border-radius: inherit;
    z-index: 10;
}

/* Включение/Выключение меча */
  
#on-off:not(:checked) + .blade, #on-off2:not(:checked) + .blade2 {
    transform: scaleY(0);
    transition: 1s;
}
  
#on-off:checked + .blade, #on-off2:checked + .blade2 {
    transform: scaleY(1);
}

@media screen and (min-width: 300px) and (max-width: 800px) {
    .lightsaber {
        margin-top: 0;
        transform: rotate(0deg);
    }
}