*
{
    margin:0;
    padding:0;
    box-sizing:border-box;
}
#feuille {
    width:90vw;
    min-height:100vh;
    margin:auto;
    background-color:beige;
}

html,body
{
    width:100vw;
    height:100vh;
}

h1
{
    color:darkblue;
    background-color:lightblue;
    padding-bottom:4px;
    padding-top:7px;
    padding-left:7px;
    padding-right:7px;
}

p
{
    margin-top:10px;
    border: 1px black solid;
}