/** div droite **/
.div_droite{
    float: right;
    margin: 0;
    padding: 0;
    display: inline-block;
    width: 10%;
}
.div_droite_conaint{
    padding: 0;
    margin: 0;
    height: 150vh;
    display:inline-block;
    width: 100%;
    background: linear-gradient(to bottom right,#FE0E06,#FA6A59,#FE0E06);
}