header{text-align:center;}
header h2{font-size:2.3em;font-weight:bold;color:#333333;}

.page{margin-bottom:30px;padding:10px 30px;margin-top: 50px;}

.page p{text-align:justify;}

.seances p{text-align:center;}
.seances article{text-align:center;cursor:pointer;}
.seances div{border: 1px solid black;margin-bottom:30px;padding:10px;}
.lien{text-decoration:none;color:#333333;}
.lien:hover{text-decoration:none;}


footer{text-align:center;}

.cours h2{text-align:center;font-size: 3em;border-bottom:solid lightgrey 1px;padding-bottom:10px;}
.cours h3{text-align:center;}

iframe{height:800px;}

.billet{height:100px;border:lightgrey 1px solid;font-size:2em ;}
#billets{margin-top:30px;}

#projet h3{background:black;color:white;height: 50px;margin-top:0px;padding-top:10px;}
#projet{border:black solid 1px;height:500px;}

.vignette{height:180px;border:1px black solid; background:lightgrey;}
.retour{text-align: center;font-size:1.4em;}

#seance5 iframe{width:100%;height:400px;}