.container {
    display: flex;
    justify-content: center;
}

.un {
    width: 760px;
    height: 760px;
    border: 20px solid rgb(255, 255, 255);
    padding: 145px 90px 50px 75px;
    background-color: rgb(10, 9, 56);
}

.un {
    width: 500px;
    height: 500px;
    padding: 100px 75px 50px 65px;
    background-color: rgb(11, 50, 223);
}

.trois {
    width: 250px;
    height: 300px;
    border: 50px solid rgb(114, 37, 17);
    padding: 100px 100px 10px 65px;
    background-color: rgb(255, 0, 0);
}