div.gallery {
    border: 1px solid #ccc;
}

div.gallery:hover {
    border: 1px solid black;
}

div.gallery img {
    width: 100%;
    height: auto;
}

div.description {
    padding: 15px;
    text-align: center;
}

* {
    box-sizing: border-box; 
}

.responsive {
    /*padding: 0 6px;*/
    padding: 61px 6px;
    /*float: left;*/
    float:left;
    width: 50%;
}

@media only screen and (max-width: 700px) {
    .responsive {
        width: 49.99999%;
        margin: 6px 0;
    }
}

@media only screen and (max-width: 500px) {
    .responsive {
        width: 100%;
    }
}

.clearfix:after {
    content: "";
    display: table;
    clear: both;
}