* {
	box-sizing: border-box;
	padding: 0;
	margin: 0;
}
body {
	font-size: 100%;
	font-weight: 300;
	color: #888;

	width: 100%;
}
a:link {
  text-decoration: none;
}

a:visited {
  text-decoration: none;
}

a:hover {
  text-decoration: none;
}

a:active {
  text-decoration: none;
}
img {
	max-width: 100%;
}

.container {
	width:1000px;


	display: block;

	text-align: center;

	background: #FFF;
}
section {
	width: 1000px;
	margin: 0 auto;
	
	background: #FFF;
}

.column {
	
	display: inline-block;
	width: 80%;
	margin: 2% auto;
	vertical-align: top;
	text-align: left;

}

.column.image_left{
	height:622px;
	background:url(../../images/Cahier-cover-pages/18.png);
	
	background-repeat: no-repeat;
	width:450px;

	
}
.column.image_right{
	height:622px;
	background:url(../../images/Cahier-cover-pages/19.png);
	
	width:450px;
	position: relative;


	
}



.clearfix {
	width: 100%;
	clear: both;
	height: 20px;
}

footer {
  

    left: 0;
    bottom: 0;
 
    width: 100%;
    overflow: hidden;
}


.go-to-exercise {
	width: 100%;
	display: inline-block;
	position: relative;

}

.go-to-exercise {
	width: 100%;
	display: inline-block;
	position: relative;
	vertical-align: top;
	
}
.go-to-exercise.regular {
	display: inline-block;
	position: relative;

}

.right_1 {
height: 254px;
display: inline-block;
position: relative;
width: 57%;
}
.right_2 {
height: 254px;
display: inline-block;
position: relative;
width: 37%;
}
.right_3 {
height: 178px;
display: inline-block;
position: relative;
width: 54%;
}
.right_4 {
height: 178px;
display: inline-block;
position: relative;
width: 37%;
}
.right_5 {
height: 78px;
display: inline-block;
position: relative;
width: 50%;
}
.right_6 {
height: 78px;
display: inline-block;
position: relative;
width: 39%;
}
.right_7 {
height: 78px;
display: inline-block;
position: relative;
width: 54%;
}


.left_1 {
	height: 450px;
	display: inline-block;
	position: relative;
}
.left_2 {
	height: 140px;
	display: inline-block;
	position: relative;
}
.left_3 {
	height: 225px;
	display: inline-block;
	position: relative;
}