:root {
    --switch-fg: #ffffff;

    --switch-bg-active: #2196f3;
    --switch-bg-inactive: #cccccc;

    --switch-transision-time: 0.2s;

    --switch-width: 60px;
    --switch-height: 34px;

    --switch-slider-width: 26px;
    --switch-slider-height: var(--switch-slider-width);
    --switch-slider-left: 4px;
    --switch-slider-bottom: var(--switch-slider-left);
}

.switch {
    position: relative;
    display: inline-block;
    width: var(--switch-width);
    height: var(--switch-height);
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;

    top: 0;
    left: 0;
    right: 0;
    bottom: 0;

    background-color: var(--switch-bg-inactive);
    -webkit-transition: var(--switch-transision-time);
    -o-transition: var(--switch-transision-time);
    transition: var(--switch-transision-time);
}

.slider:before {
    position: absolute;
    content: "";

    width: var(--switch-slider-width);
    height: var(--switch-slider-height);

    left: var(--switch-slider-left);
    bottom: var(--switch-slider-bottom);

    background-color: var(--switch-fg);

    -webkit-transition: var(--switch-transision-time);
    -o-transition: var(--switch-transision-time);
    transition: var(--switch-transision-time);
}

input:checked + .slider {
    background-color: var(--switch-bg-active);
}

input:focus + .slider {
    -webkit-box-shadow: 0 0 1px var(--switch-bg-active);
    box-shadow: 0 0 1px var(--switch-bg-active);
}

input:checked + .slider:before {
    -webkit-transform: translateX(26px);
    -ms-transform: translateX(26px);
    transform: translateX(26px);
}

.slider.round {
    border-radius: 34px;
}

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