html {
    font-family: Arial, Helvetica, sans-serif;
}

header {
    background-color: rgb(39, 140, 180);
    padding: 100px; 
    width: 100%;
    height: auto;  
    position: relative;
    top: 0;  
    left: 0; 
    /*z-index: 1000; 
    box-sizing: border-box; */
    margin-top: auto;
    margin-right: auto;
    margin-bottom: auto;
    margin-left: auto;

}

p {
    font-weight: bold;
}

img{
    position: static;
}



.centrer{
    text-align: center;
}