magcms/materialize/css/style.css

.galleries-grid {
    width: 100%;
    height: 100%;
    position: relative;
    text-align: center;
    margin: 0 auto;
    padding: 0px;
}

.galleries-line {
    width: 100%;
    height: 100%;
}

.gallery-square {
    width: 47%;
    height: 100%;
    float: left;
    margin: 0 1.5% 3%;
    padding-bottom: 47%;
    position: relative;
}

.gallery-cover {
    position: absolute;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 100%;
    background-position: center center;
    background-size: cover;
}

.gallery-title {
    color: white;
    width: 100%;
    position: absolute;
    top: initial;
    bottom: 0px;
    text-align: center;
    z-index: 3;
    background: transparent -moz-linear-gradient(center top , rgba(255, 255, 255, 0) 0%, transparent 1%, rgba(0, 0, 0, 0.07) 26%, rgba(0, 0, 0, 0.5) 71%, rgba(0, 0, 0, 0.7) 100%) repeat scroll 0% 0%;
    padding: 20% 0 0;
}