#contenu_texte1{
float:left;
width:820px;
height:340px;
text-align:justify;
/*border: 1px solid blue;   */ 
}

#contenu_texte2{
float:left;
width:820px;
height:225px;
text-align:justify;
/*border: 1px solid red;  */
margin-top: 10px;   
}