body {
	font-size:25px;
}

h2 {
	color:blue;
	font-size:35px;
	margin-right:50px;
	text-align:center;
	border-bottom:solid;
}

#exercice {
	text-align:center;
}

.tabl_sgn{
	position:absolute;
	font-size:25px;
	transform:translate(-50%,-50%);
}