body { 
     background-color: #2F4F4F; 
     }
  th { 
       font-family: sans-serif; 
       font-size: large:
       font-weight: bold;
       background: #2F4F4F;
       border: 2px solid #2F4F4F;
       margin-top: -10%;
       }
  td {
       border: 1px solid #2F4F4F;
       background-color: #2F4F4F; 
     }