body
{ 
background-image: url(wallpaper.png)
}

header
{text-align: center;
color: white;
}

h1
{
text-align: center;
color: Silver;
}

p
{
font-family: verdana;
font-style: new times roman;
color: silver;
width: 70%;
border: 1px solid black;
text-align: justify;
padding: 5px; 
margin: 9px;
}

footer
{
font-style: comic sans ms;
text-align: center;
color: silver;
width: 100%;
border: 1px solid black;
text-align: justify;
padding: 9px; 
margin: 9px;
}

aside
{
text-align: right;
font-family: verdana;
font-style: comic sans ms;
color: white;
width: 20%;
border: 1px solid black;
padding: 9px; 
margin: 9px;
}

#conteneur
{
    display: flex;
    flex-wrap: wrap;
}
.element:nth-child(2)
{
    flex: 1;
}