#demoIzq, #demoDer { border:1px dashed; width:100px; background-color:#EAEAEA; text-align:center; }

#demoDer { float:; }

select { width:220px; }
.cajamsg{position:absolute;background:#ffffff;width:600px;height:420px;left:50%;top:50%;margin-left:-300px;margin-top:-210px;border:solid 5px #0489B1;color:#0d0d0d;}
.enviar{width:80px;height:25px;background:#0489B1;border:solid 2px #0B3861;color:#ffffff;margin-left:210px; cursor: hand;cursor: pointer}
.enviar:hover{background:#01A9DB;font-weight:bold;}