.image-file-view:before {
    content: ' '; 
    display: inline-block;
    vertical-align: middle;
    height: 100%;
    font-size: 0;
    line-height: 0;
}
#image-view {
    padding: 1px; 
    background: #fff;
    border: 1px solid #eee;
    width: auto;
    height: auto;
    max-width: calc(100% - 4px);
    max-height: calc(100% - 4px);
    font-size: 0;
    line-height: 0;
}