.gallery {
    list-style-type: none;
    margin: 0px;
    padding: 0px;

}

.gallery li{
    float: left;
    padding: 0px;
    position: relative;
    overflow: hidden;
}


.gallery img{
    margin: 0px;
    padding: 0px;
    float: left;
    z-index: 4;
}



#preview {
    position: absolute;
    padding: 10px 10px 0 10px;
    display: none;
    background-color: #424242;
}
#preview p {
    color: white; 
    margin-top: 3px;
    margin-bottom: 3px;
}

.gray {
     filter: grayscale(100%);
    -webkit-filter: grayscale(100%);
}