header {
    /* The image used */
    background-image: url("../images/testbkgd.jpg");

   

    /* Position and center the image to scale nicely on all screens */
    background-position: center;
    background-repeat: repeat;
    background-size: cover;
    position: relative;
  width: 100%;

}
 
    main {
     background-color:#000066;
  border: 5px double #ffffff;
  margin-right: auto;
  margin-left: auto;
color:white;
}   
td
{
height:20px;
width:20px;
}