diff --git a/style.css b/style.css
new file mode 100644
index 0000000..851c3bb
--- /dev/null
+++ b/style.css
@@ -0,0 +1,85 @@
+/*Pour toutes les pages : */
+
+body{background-color: #ffffff}
+
+header {font-size: 23px;
+	background-color: #333;
+    color: #fff;
+    padding: 10px 0;
+    text-align: center;
+}
+
+h1.Hello {font-size: 50px;
+	text-align: center;}
+
+header nav {margin-left: auto;
+	margin-right: auto;
+    width: 90%;
+    display: flex;
+    align-items: center;
+    justify-content: space-between;}
+
+header nav a {color : black;
+    text-decoration: none;}
+
+
+p.html{font-size: 30px;
+	margin-left: 2%;}
+
+
+/*Pour la page index*/
+
+h1{text-align: center;
+	font-size: 100px;
+	font-family:monospace; }
+
+h2.nsi{text-align: center;
+	font-family: cursive;
+	font-size: 170%;
+	margin-top: -1%}
+
+p.presentation{font-size: 165%;
+	margin-top: 85px;
+	margin-left: 11%;
+	margin-right: 11%;
+	text-align: justify;}
+
+div.licence{text-align: center;
+	font-size: 26px;}
+
+
+/*Pour la page cours :*/
+
+h1.cours{font-size: 60px;}
+
+div.presentation{font-size: 20px;}
+
+div.presentation a {color : #50468C;
+    text-decoration: none;
+	font-size: 17px}
+
+div.presentation a.hdp {color : blue;
+	text-decoration: none;
+	font-size: 25px}
+
+div.presentation td{text-align:center;}
+
+div.presentation a.btn:hover{color: white;
+	background-color: #50468C;
+	transition: 0.3s all;}
+
+a.eve{
+	border-radius: 30px;
+	background-color: #FFFF;
+	padding-right: 6px;
+	padding-left: 6px;
+}
+
+
+
+
+footer {font-size: 23px;
+    color: #fff;
+    padding: 10px 0;
+    text-align: right;
+}