:root {
    --toggle-light: hsl(230, 22%, 74%);
    --toggle-dark: linear gradient hsl(210, 78%, 56%) to hsl(146, 68%, 55%);
}
/* The switch - the box around the slider */
.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 30px;
}

/* Hide default html checkbox */
.switch input {
    opacity: 0;
}

/* The slider */
.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--toggle-light);
    transition: 0.4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 32px;
    bottom: 5px;
    background-color: #fff;
    transition: 0.4s;
}

input:checked + .slider {
    background: linear-gradient(90grad, hsl(210, 78%, 56%), hsl(146, 68%, 55%));
}

input:checked + .slider:before {
    transform: translateX(-24px);
}
.slider,
.round {
    border-radius: 34px;
}

.round::before {
    border-radius: 50%;
}

input:checked + .round::before {
    background-color: hsl(230, 17%, 14%);
}