#numex19{
position:relative;
left:5px;
top:0px;
z-index: 1;
}

#enonce_ex19{
position:relative;
left:5px;
top:0px;
z-index: 1;
}

#evolutions{
float:left;
margin-left:22%;
width: 75%;
}

#tableur2{
float:left;
margin-left:12%;
}

#DV{
float:left;
margin-left:65px;
background-color: #eee;
}