* {
   margin: 0px;
   padding: 0px;
   }

body {
   font-family: 'Trebuchet MS', Arial, Helvetica, serif;
   text-align: center;
   margin: 10px auto 10px;
   }
   
#centro {
   width: 980px;
   margin: 10px auto 10px;
   }

.cnt {
   background-color: #0000;
   padding: 5px;
   border: 1px solid #c0c0c0;
   }