/* Header */


#image
{
	float:left;
}

header h1
{
    font-family: arial;
    font-size: 28px;
    margin-top: 6px;
    font-weight: normal;
}
/* Navigation */

nav ul
{
    list-style-type: none;
    display: flex;
}

nav li
{
	margin-top:100px;
	margin-right:5px;
}

nav a
{
    font-size: 20px;
	background-color:grey;
    color: white;
    padding-bottom: 3px;
    text-decoration: none;
	text-align: center;
	padding:5px;
	border: 2px solid;
	border-radius:2px;
	border-color:black;
}

nav a:hover
{
    color: red;
    border-bottom: 3px solid red;
}

body
{
  width: 1400px;
  margin: auto;
  background-image:url("OS1.jpg");
  background-attachment:fixed;
  background-repeat:no-repeat;
  background-size:100%;
}  
footer
{
border:5px solid black;
border-radius:5px;
text-align:center;
font-family:arial;
font-size: 20px;
margin:10px;
}
   .centre{
   width: 1200px;
   margin: auto;
   }
  .bleu{
  color:red;
  font-weight: bold;
  }
  .s{
  color: red;
  text-decoration: underline;
  font-weight:bold;
  font-family:arial;
  font-size: 32px;
  text-align: center;
  }
  #para
{
	font-family: arial;
    font-size: 28px;
    margin-top:70px;
    font-weight: normal;
}
#para1
{
    font-family: arial;
    font-size: 25px; 
	text-align: center;
	font-weight:normal;
}
#para2
{
    font-family: arial;
    font-size: 22px; 
	font-weight:normal;
}
#para3
{
    font-family: arial;
    font-size: 28px;
    color:blue;
    text-decoration: underline;
	text-align: left;
	font-weight:normal;
}
	/*source*/
  
  a{
  color:black;
  font-family:arial;
  font-size:22px;
  }
  a:hover{
  color:green;
  text-decoration:blink;
  }