nav{
display: inline-bock;
width: 15%;
border: 1px solid black;
vertical-align: top;
}
section{
display: inline-bock;
border: 1px solid blue;
vertical-align: top;
}
a{
color: red;
}
body{
background-color: yellow;
color: green;
}
.centre{
text-align: center;
}
h2{
color: blue;
}
h3{
color: blue;
}
h1{
color: blue;
}
#attention{
font-size: 14px;
border: 1px solid black;
}