body{
	margin: 0px;
}
header{
	background-color: green;
	position: fixed;
	width: 100%;
}
h1, h2, h3{
	margin-top: 0px;
}
ul{
	margin-bottom: 0px;
}
section{
	height: 100vh;
}
 #exppro{
	background-color: blue;
 }
 #competences{
	background-color: yellow;
 }
 #formations{
	background-color: pink;
 }
 #contact{
	background-color: violet;
 }
 footer{
	background-color: orange;
 }