.selected {
    background-color: rgba(255,0,0, 0.3);
}

span:hover {
    background-color: rgba(255,0,0, 0.3);
}

#image_container {
    float: left;
    margin-right: 1em;
}

#texte-non-corrige {
    margin-top:0cm;
    width: 10cm;
    float: left;
}

#texte-corrige {
    margin-top:0cm;
    width: 10cm;
    float: left;
}