.trans-black{
    background: rgba(0, 0, 0, 0.5);
}
.grid-item { width: 300px; }

.img-inline > li{
    display: inline !important;
}

.img-inline > li img{
    margin-bottom: 15px;
}

#photos {
    /* Prevent vertical gaps */
    line-height: 0;
    -webkit-column-count: 3;
    -webkit-column-gap:   0;
    -moz-column-count:    3;
    -moz-column-gap:      0;
    column-count:         3;
    column-gap:           0;
}

#photos img {
    /* Just in case there are inline attributes */
    width: 100% !important;
    height: auto !important;
}

@media (max-width: 1200px) {
    #photos {
        -moz-column-count:    2;
        -webkit-column-count: 2;
        column-count:         2;
    }
}
@media (max-width: 1000px) {
    #photos {
        -moz-column-count:    3;
        -webkit-column-count: 3;
        column-count:         3;
    }
}
@media (max-width: 800px) {
    #photos {
        -moz-column-count:    2;
        -webkit-column-count: 2;
        column-count:         2;
    }
}
@media (max-width: 400px) {
    #photos {
        -moz-column-count:    1;
        -webkit-column-count: 1;
        column-count:         1;
    }
}