*, *:before, *:after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.root {
    padding: 15px;
}

.gallery {
    display: grid;
    grid-template-columns: auto;
    grid-gap: 5px 5px;
    font-size: 16px;
    max-width: 1200px;
    margin: auto;
}

.gallery__item {
    position: relative;
    cursor: pointer;
}

.gallery__img {
    display: block;
    max-width: 100%;
}

.gallery__item:before, .gallery__item:after {
    position: absolute;
    transition: all .2s;
}

.gallery__item:before {
    color: #fff;
    font-size: 0;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;
}

.gallery__item:hover:before {
    font-size: 1.5rem;
}

.gallery__item:after {
    display: block;
    content: '';
    top: 50%;
    bottom: 50%;
    left: 50%;
    right: 50%;
    background-color: rgba(0 ,0 , 0, .4);
    z-index: 1;
}

.gallery__item:hover:after {
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}

.gallery__item:after, .gallery__item, .gallery__img {
    border-radius: 5px;
}

.gallery-lightbox {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgba(0 ,0 , 0, .8);
    font-size: 16px;
    padding: 0 15px;
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 3;
}

.gallery-lightbox.show {
    display: flex;
}

.gallery-lightbox__modal {
    position: relative;
    background-color: #fff;
    padding: 5px;
    max-width: 750px;
    border-radius: 5px;
}

.gallery-lightbox__img {
    display: block;
    width: 100%;
}

.gallery-lightbox__control {
    position: absolute;
    cursor: pointer;
}

.gallery-lightbox__control:before {
    display: block;
}

.gallery-lightbox__control.icon-close {
    top: -14px;
    right: -14px;
    padding: 5px;
    background-color: #fff;
    border-radius: 50%;
    font-size: .8rem;
}

.gallery-lightbox__control.icon-back, .gallery-lightbox__control.icon-next {
    top: 50%;
    font-size: 2rem;
    transform: translateY(-50%);
    color: #fff;
}

.gallery-lightbox__control.icon-back {
    left: 10px;
}

.gallery-lightbox__control.icon-next {
    right: 10px;
}

@media screen and (min-width: 576px) {
    .gallery {
        grid-template-columns: repeat(2, auto);
    }
}

@media screen and (min-width: 768px) {
    .gallery {
        grid-template-columns: repeat(3, auto);
    }

    .gallery-lightbox__control.icon-close {
        top: -19px;
        right: -19px;
        font-size: 1.2rem;
    }

    .gallery-lightbox__control.icon-back, .gallery-lightbox__control.icon-next {
        font-size: 3rem;
    }
}

@media screen and (min-width: 992px) {
    .gallery {
        grid-template-columns: repeat(4, auto);
    }
}