.switch {
    position: relative;
    display: inline-block;
    width: 30px;
    height: 15px;
}

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

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: 0.3s;
    border-radius: 15px;
}

    .slider::before {
        position: absolute;
        content: "";
        height: 11px;
        width: 11px;
        left: 2px;
        bottom: 2px;
        background-color: white;
        transition: 0.3s;
        border-radius: 50%;
    }

input:checked + .slider {
    background-color: #182626;
}

    input:checked + .slider::before {
        transform: translateX(15px); /* 30 - 11 - 4 = 25 */
    }