gmx.css/src/_switch.css

A micro Material Design 3 based CSS-only framework.

.switch {
    position: relative;
    display: inline-block;
    width: 3.25rem;
    height: 2rem;
}

.switch>span {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--m3-scheme-surface-container-highest);
    border: solid .125rem var(--m3-scheme-outline);
    transition: .2s;
    border-radius: 2rem;
}

.switch>span:before {
    position: absolute;
    content: "";
    width: 1rem;
    height: 1rem;
    left: .4rem;
    bottom: .4rem;
    background: var(--m3-scheme-outline);
    transition: .2s;
    border-radius: var(--m3-switch-handle-shape);
}

.switch>input:not(:checked):active+span::before {
    width: 1.7rem;
    height: 1.7rem;
    bottom: 1px;
    left: 1px;
}

.switch>input:hover+span {
    border-color: var(--m3-scheme-on-surface-variant);
}

.switch>input:hover+span:before {
    background: var(--m3-scheme-on-surface-variant);
    box-shadow: 0 0 0 .95rem rgb(from var(--m3-scheme-outline) r g b / 20%);
}

.switch>input:checked+span {
    background: var(--m3-scheme-primary);
    border-color: var(--m3-scheme-primary);
}

.switch>input:checked+span:before {
    width: 1.55rem;
    height: 1.55rem;
    background: #ffffff;
    transform: translateX(1rem);
    bottom: 1.5px;
}

.switch>input:checked:hover+span:before {
    background: var(--m3-scheme-secondary-container);
    box-shadow: 0 0 0 .75rem rgb(from var(--m3-scheme-outline) r g b / 20%);
}

.switch>input:checked:active+span::before {
    width: 1.8rem;
    height: 1.8rem;
    bottom: 0px;
    left: 4px;
}

.switch>input:checked+span::after {
    content: '';
    display: block;
    position: absolute;
    top: .45rem;
    right: .65rem;
    width: .3rem;
    height: 11px;
    border: solid var(--m3-scheme-primary);
    border-width: 0 .15em .15em 0;
    transform: rotate(45deg);
}