html, body{
    margin:0;
    padding:0;
    width:100%;
    height:100%;
}

div{
    height: 100px;
    width: 100px;
    position: relative;
    float: left;
    margin:0;
    padding:0;
}


#bloc1{
    background-color:#0000FF;
}

#bloc2{
    background-color:#00FF00;
}

#bloc3{
    background-color:#FF00FF;
}

#bloc4{
    background-color:#7600ff;
}

#bloc5{
    background-color:#ffff00;
}