.titulo{float:left;
width:100%;
height:100px;
font-weight:bold;
text-align:center;
font-family: tahoma;
color:black;
background-color:Red;
font-size:50px;
  }
.IZQUIERDA{float:left;
width:650px;
height:600px;
font-weight:bold;
text-align:left;
font-family: VERDANA;
color:red;
background-color:lightyellow;
  }
.centro{float:right;
width:650px;
height:600px;
font-weight:bold;
text-align:left;
font-family:Sans-serif;
color:black;
background-color:lightblue;
  }