body { font-family: sans-serif; }

.gallery {
background: #eeeeee00;
}

.gallery-cell {
    width: 100%;
    margin: 25px 10px 10px 3px;
    counter-increment: gallery-cell;
  }

.gallery-cell img{
    width: 100%;
    margin-right: 10px;
    background: #8C8;
    counter-increment: gallery-cell;
    }

/* cell number */
.gallery-cell:before {
display: block;
text-align: center;
content: counter(gallery-cell);
line-height: 200px;
font-size: 80px;
color: white;
}