style.css

/* Use borderbox */
.switch-button, .switch-button * {
    box-sizing: border-box;
}

/* Just a container */
.switch-button { }

/* Hide the magic */
.switch-button > input {
    display: none;
}

/* Unchecked state */
.switch-button > label {
    cursor: pointer;
    display: inline-block;
    position: relative;
    width: 80px;
    height: 34px;
    padding: 2px;
    border: none;
    border-radius: 26px;
    font-size: 15px;
    background: #f4f5f5;
    box-shadow: inset 0 1px 3px rgba(0,0,0,.25);
    transition: background-color .18s ease-out;
    will-change: background-color;
    font-family: 'Roboto', sans-serif;

    /* Do not select anything */
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* Unchecked state - knob */
.switch-button > label::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    bottom: 2px;

    width: 30px;
    height: 30px;
    border-radius: 50%;
    background-color: #fff;
    box-shadow: 0 1px 3px rgba(0,0,0,.25);
    transition: left .18s ease-out;
    will-change: left;
}

/* Unchecked state - response text */
.switch-button > label::before {
    content: attr(data-false);

    position: absolute;
    top: 2px;
    bottom: 2px;
    left: 2px;
    right: 2px;
    text-align: right;

    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    bottom: 0;

    padding: 0;
    padding-right: 15px;
    line-height: 35px;
    text-align: right;
    -webkit-font-smoothing: antialiased;
    color: #717784;
    will-change: text-align;
}

/* Checked state */
.switch-button > input:checked + label {
    background-color: #74ba02;
}

/* Checked state - knob */
.switch-button > input:checked + label::after {
    left: calc(100% - 32px);
}

/* Checked state - response text */
.switch-button > input:checked + label::before {
    content: attr(data-true);
    padding-right: 0;
    padding-left: 11px;
    text-align: left;
    color: #fff;
}