.header { 
height: 150px; 
width: 600px; 
border: thin solid #000000; 
} 
.conteneur { 
height: 400px; 
width: 600px; 
border: thin solid #000000; 
} 
.list { 
height: 400px; 
width: 400px; 
overflow: scroll; 
float: left; 
border: thin solid #000000; 
} 

.colgauche { 
height: 400px; 
width: 100px; 
float: left; 
} 
.coldroite { 
height: 400px; 
width: 100px; 
float: right; 
}