.switch {
    font-size: 17px;
    position: relative;
    display: inline-block;
    width: 3.5em;
    height: 2em;
}

/* Hide default HTML checkbox */
.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

/* The slider */
.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #223243;
    transition: .4s;
    border-radius: 30px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 1.4em;
    width: 1.4em;
    border-radius: 20px;
    left: 0.3em;
    bottom: 0.3em;
    background-color: #223243;
    box-shadow: inset 2px -2px 0 1.8px #fff;
    transition: .4s;
    animation: anima1 0.3s linear;
}

@keyframes anima1 {
    0% {
        transform: translateX(1.5em);
    }

    80% {
        transform: translateX(-0.3em);
    }

    100% {
        transform: translateX(0em);
    }
}

.switch input:checked + .slider:before {
    background-color: yellow;
    box-shadow: none;
    transform: translateX(1.5em);
    animation: anima 0.3s linear;
}

@keyframes anima {
    0% {
        transform: translateX(0px)
    }

    80% {
        transform: translateX(1.6em)
    }

    100% {
        transform: translateX(1.4em)
    }
}