.masonry, .masonry-2 {
    -webkit-column-count: 4;
    -moz-column-count:4;
    column-count: 4;
    -webkit-column-gap: 1em;
    -moz-column-gap: 1em;
    column-gap: 1em;
    padding: 0;
    -moz-column-gap: 1.5em;
    -webkit-column-gap: 1.5em;
    column-gap: 1.5em;
}

.masonry-2 {
    -webkit-column-count: 2;
    -moz-column-count:2;
    column-count: 2;
}

.masonry-item {
    display: inline-block;
    background: #fff;
    margin: 0 0 1.5em;
    width: 100%;
    box-sizing: border-box;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
}

.masonry-item img {
    max-width:100%;
}

@media only screen and (max-width: 320px) {
    .masonry, .masonry-2 {
        -moz-column-count: 1;
        -webkit-column-count: 1;
        column-count: 1;
    }
}

@media only screen and (min-width: 321px) and (max-width: 768px){
    .masonry {
        -moz-column-count: 2;
        -webkit-column-count: 2;
        column-count: 2;
    }
}

@media only screen and (min-width: 769px) and (max-width: 1200px){
    .masonry {
        -moz-column-count: 3;
        -webkit-column-count: 3;
        column-count: 3;
    }
}

@media only screen and (min-width: 1201px) {
    .masonry {
        -moz-column-count: 4;
        -webkit-column-count: 4;
        column-count: 4;
    }
}