gnu-social/plugins/GNUsocialPhotos/res/style.css

.photocontainer, .albumcontainer { 
    display: block; 
    background-color: yellow; 
    float: left; 
    padding: 20px; 
    margin: 15px; 
}

.photodescription {
    display: block;
    background-color: #dddddd;
    padding: 20px;
    margin: 15px;
}