[type="radio"]:checked,
[type="radio"]:not(:checked) {
    position: absolute;
    left: -9999px;
}

.checkbox:checked + label,
.checkbox:not(:checked) + label {
    position: relative;
    cursor: pointer;
    margin: 0 auto;
    text-align: center;
    margin-right: 6px;
    margin-left: 6px;
    display: inline-block;
    width: 50px;
    height: 50px;
    border: 3px solid #bdc3c7;
    background-size: cover;
    background-position: center;
    box-sizing: border-box;
    -webkit-transition: all 0.2s ease;
    transition: all 0.2s ease;
    background-image: url('https://assets.codepen.io/1462889/sl1.jpg');
    animation: border-transform 6s linear infinite alternate forwards;
    -webkit-animation-play-state: paused;
    -moz-animation-play-state: paused;
    animation-play-state: paused;
}


.checkbox:checked + label {
    box-shadow: 0 8px 25px 0 rgba(16, 39, 112, .3);
    transform: scale(1.3);
    -webkit-animation-play-state: running;
    -moz-animation-play-state: running;
    animation-play-state: running;
}


.slider-height-padding {
    padding-top: 550px;
}

ul.gal {
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    width: 100%;
    z-index: 100;
    padding: 0;
    margin: 0;
    list-style: none;
}

ul.gal li {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    display: block;
    z-index: 100;
    padding: 0;
    margin: 0;
    list-style: none;
    height: 580px;
    border: 5px solid #bdc3c7;
    background-size: cover;
    background-position: 100% 100%;
    background-image: url('https://assets.codepen.io/1462889/sl1.jpg');
    border-radius: 50%;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
    font-weight: 900;
    font-size: 16px;
    letter-spacing: 2px;
    line-height: 2.7;
    color: #343434;
    writing-mode: vertical-rl;
    opacity: 0;
    pointer-events: none;
    box-shadow: 0 8px 25px 0 rgba(16, 39, 112, .1);
    -webkit-transition: all 0.5s ease;
    transition: all 0.5s ease;
}

ul.gal li span {
    mix-blend-mode: difference;
}

.logo {
    position: absolute;
    top: 30px;
    right: 30px;
    display: block;
    z-index: 100;
    transition: all 250ms linear;
}

.logo img {
    height: 26px;
    width: auto;
    display: block;
}


@media (max-width: 767px) {
    .slider-height-padding {
        padding-top: 340px;
    }

    ul.gal li {
        height: 300px;
        font-size: 13px;
        letter-spacing: 1px;
    }
}

@media (max-width: 575px) {
    .slider-height-padding {
        padding-top: 240px;
    }

    ul.gal li {
        height: 200px;
    }
}