.slider input[type="checkbox"] {
    margin: 10px;
    position: relative;
    width: 120px;
    height: 40px;
    -webkit-appearance: none;
    background: linear-gradient(0deg, #333, #000);
    outline: none;
    border-radius: 20px;
    box-shadow: 0 0 0 4px #353535, 0 0 0 5px #3e3e3e, inset 0 0 10px rgba(0,0,0,1);
}

.slider input:checked[type="checkbox"]:nth-of-type(1) {
    background: linear-gradient(0deg, #e67e22, #f39c12);
    box-shadow: 0 0 0 4px #353535, 0 0 0 5px #3e3e3e, inset 0 0 10px rgba(0,0,0,1);
}

.slider input:checked[type="checkbox"]:nth-of-type(2) {
    background: linear-gradient(0deg, #70a1ff, #1e90ff);
    box-shadow: 0 0 0 4px #353535, 0 0 0 5px #3e3e3e, inset 0 0 10px rgba(0,0,0,1);
}

.slider input[type="checkbox"]:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 80px;
    height: 40px;
    background: linear-gradient(0deg, #000, #6b6b6b);
    border-radius: 20px;
    box-shadow: 0 0 0 1px #232323;
    transform: scale(.98,.96);
    transition: .5s;
}

.slider input:checked[type="checkbox"]:before {
    left: 40px;
}

.slider input[type="checkbox"]:after {
    content: '';
    position: absolute;
    top: calc(50% - 2px);
    left: 70px;
    width: 4px;
    height: 4px;
    background: linear-gradient(0deg, #6b6b6b, #000);
    border-radius: 50%;
    transition: .5s;
}

.slider input:checked[type="checkbox"]:after {
    left: 110px;
}