body
{
background-color: blue;
 margin:auto;
}

#cadre_gauche
{
   width: 1250px;
   text-align: justify;
   margin-top:0px;
   margin-left:0px;
   border:solid 1px blue;
   height:174px;
   background-color: yellow;
}
#autre_cadre
{
   width: 156px;
   text-align: justify;
   margin-left: 10px;
   border:solid 1px red;
   height: 1000px;
   background-color: green;
}
#troisieme_cadre
{
  position:absolute;
  right:177px;
  top:176px;
  left:180px;
  
  border:solid 3px green;
  width:750px;
  background-color: red;
}  
em
{
color: blue;
}
#image
{
position:absolute;
top:650px;
left:350px;
}