.masonry { /* Masonry container */
    column-count: 4;
    column-gap: 1em;
}

.item { /* Masonry bricks or child elements */
    background-color: #fff;
    display: inline-block;
    margin: 0 0 1em;
    width: 100%;
}

body {
    font: 0em/1 "Open Sans", Helvetica, Arial, Sans-serif;
    margin: .25em;
    background: #FFF;
}

.wrapper {
    width: 100%;
    margin: 3em auto;
}

.masonry {
    margin: 1.5em 0;
    padding: 0;
    -moz-column-gap: 1.5em;
    -webkit-column-gap: 1.5em;
    column-gap: 1.5em;
    font-size: .85em;
}

.item {
    display: inline-block;
    background: #fff;
    padding: 1em;
    margin: 0 0 1.5em;
    width: 100%;
    box-sizing: border-box;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-shadow: 1.5px 1.5px 1.5px 1.5px #ccc;
}

@media only screen and (min-width: 400px) {
    .masonry {
        -moz-column-count: 2;
        -webkit-column-count: 2;
        column-count: 2;
    }
}

@media only screen and (min-width: 700px) {
    .masonry {
        -moz-column-count: 3;
        -webkit-column-count: 3;
        column-count: 3;
    }
}

@media only screen and (min-width: 900px) {
    .masonry {
        -moz-column-count: 4;
        -webkit-column-count: 4;
        column-count: 4;
    }
}

@media only screen and (min-width: 1100px) {
    .masonry {
        -moz-column-count: 5;
        -webkit-column-count: 5;
        column-count: 5;
    }
}

@media only screen and (min-width: 1280px) {
    .wrapper {
        width: 1260px;
    }
}