.tabla2 {
  width: 800px;
  border: 0px solid #000;
    margin-left: auto;
    margin-right: auto;
    text-align: left;
    font-family: verdana, arial, sans-serif; font-size: 12px;
}

.tabla2 th, .tabla2 td {
  border: 0px solid #cccccc;
  width: 25%;

}