img{
    font-size: 0px;
}
img:before {
    content: " ";
    display: block;

    position: absolute;
    top: -10px;
    left: 0;
    background-color: rgb(230, 230, 230);
    border: 2px dotted rgb(200, 200, 200);
    border-radius: 5px;
}

img:after {
    content: "\f127" " obrázek je poškozený";
    display: block;
    min-height: 35px;
    margin-top: 50%;
    margin-bottom: 50%;
    font-size: 12px;
    font-style: normal;
    font-family: FontAwesome;
    color: rgb(100, 100, 100);
    text-align: center;
}