.contenu_accueil{

background: url('images/back_accueil.jpg') no-repeat;
background-color:#ffffff;
background-position: -50px -15px;
width: 955px;
text-align:left;
}
.contenu_accueil_texte{
/*border:1px solid #000000;*/
margin: 0 0 0 325px;
text-align:left;
height:265px;
position: relative;
z-index:2;
}