.un {
    width: 760px;
    height:660px;
    border: 20px solid sandybrown;
    background-color: blueviolet;
    padding: 120px 0px 120px 80px;
}

.deux {
    width: 600px;
    height: 600px;
    padding: 60px 40px 20px 40px;
    background-color:violet;
}

.trois {
    width: 400px;
    height: 400px;
    padding: 200px 90px 0px 80px;
    background-color:rgb(238, 130, 182);
}

.quatre {
    width: 350px;
    height: 300px;
    padding: 0px 30px 20px 30px;
    background-color:rgb(182, 130, 238);
}