Fixing some CSS and restrictingthe CSS to only the new part

evenements/dev_workshop.html

-<div>
-	<style type="text/css">
-	.header {
+<style type="text/css">
+	.event .header {
 		background: #fff;
 		height: 220px;
-		margin-bottom: 10px;
+		margin-bottom: 1em;
 		background-color: #487ed5;
-		padding-top: 15px;
+		padding-top: 1.5em;
 	}
 
-	.header .logo {
+	.event .header .logo {
 		background-image: url('https://wiki.laquadrature.net/images/b/b0/Logo_devs_lqdn.png');
 		background-repeat: no-repeat;
 		background-size: contain;
@@ -18,20 +17,19 @@
 		margin-right: auto;
 	}
 
-	.header .text {
+	.event .header .text {
 		font-size: 5em;
 		font-family: 'Courier New', Courier, modern, monospace;
 		font-weight: normal;
 		text-align: center;
 		color: #fff;
-		margin-top: 10px;
+		margin-top: 1.5em;
 	}
 
 
-	p {
+	.event p {
 		font-style: normal;
 		font-weight: normal;
-		font-size: 1.4em;
 		font-family: Tahoma, Geneva, sans-serif;
 		line-height: 1.5;
 		text-align: left;
@@ -40,7 +38,7 @@
 
 	}
 
-	h1 {
+	.event h1 {
 		font-style: normal;
 		font-weight: normal;
 		font-size: 3em;
@@ -48,15 +46,15 @@
 		color: #fff;
 		margin-left: 3em;
 		margin-right: 3em;
-		text-align: left;
+		text-align: center;
 		font-family: 'Courier New', Courier, modern, monospace;
 
 	}
 
-	h2 {
+	.event h2 {
 		font-style: normal;
 		font-weight: normal;
-		font-size: 1.5em;
+		font-size: 2em;
 		line-height: 1.3;
 		font-family: 'Courier New', Courier, modern, monospace;
 		text-align: left;
@@ -66,70 +64,58 @@
 		color: #fff !important;
 	}
 
-	h2 a {
+	.event h2 a {
 		color: #fff !important;
 	}
 
-	h3 {
+	.event h3 {
 		font-style: normal;
 		font-weight: bold;
-		font-size: 2em;
+		font-size: 1.5em;
 		line-height: 1.3;
 		font-family: 'Courier New', Courier, modern, monospace;
 		text-align: left;
-		margin-left: 70px;
+		margin-left: 5em;
 	}
 
-	b {
-		font-size: 1.5em;
+	.event b {
 		line-height: 1.5;
 		font-family: Tahoma, Geneva, sans-serif;
-
+		font-weight: 700;
 	}
 
-	p a {
+	.event p a {
 		font-style: normal;
 		color: #2C6ABB;
-		font-size: 1.5em;
 		font-family: Tahoma, Geneva, sans-serif;
 		line-height: 1.5;
 	}
 
-	p a:after {
+	.event p a:after {
 		content: ' \279a'
 	}
 
-	p a:hover{
+	.event p a:hover{
 		text-decoration: underline;
 		color: #3d94ff;
 	}
 
-	p a:visited{
+	.event p a:visited{
 		color: #1a3f70;
 	}
 
 
-	li {
+	.event li {
 		font-style: normal;
 		font-weight: normal;
-		font-size: 1.5em;
 		margin-left: 5em;
 		text-align: left;
 		line-height: 1.5;
 		font-family: 'Courier New', Courier, modern, monospace;
 
 	}
-
-	body {
-		background-color:#F6F6F6;
-		font-family:Arial,serif;
-		margin:0;
-		padding:0;
-		min-width: 100%;
-		-webkit-text-size-adjust:none;
-		-ms-text-size-adjust:none;
-	}
-	</style>
+</style>
+<div class="event">
 	<div class="header">
 		<div class="logo">&nbsp;</div>