*{
    padding: 0;
    margin: 0;
}

header{
    box-sizing: border-box;
    height: 50px;    
    display: flex;
    justify-content: space-between;
}

section{
    box-sizing: border-box;
    /*border: 1px solid red;*/
    display: flex;
}

#estructuregauche{
    width: 20%;
    height: 900px;
}

#estructurecentre{
    width: 60%;
    height: 900px;
}

#estructuredroit{
    width: 20%;
    height: 900px;
}

/*header*/


.block-gauche{
    background-color: #c0392b;
    width: 150px;
    height: 50px;
}

.block-droit{
    width: 200px;
    height: 50px;
    justify-content: center;
    display: flex;
}

.block-droit-gauche{
    background-color: #bdc3c7;
    width: 80px;
    height: 50px;
    margin-right: 10px;
}

.block-droit-droit{
    background-color: #8e44ad;
    width: 80px;
    height: 50px;
}