html { 
   background-image: url(food-712665.jpg);
   background-attachment:"scroll";
   background-repeat: no-repeat;    
   background-size: auto;
    background-position: center;
    height: 500px;
    
}
.link { color:blueviolet} #para enlaces

.vlink { color: darkgreen} #para visitados

.alink { color: darkblue} #para activos

    
thead {
  background-color: red;
  }
tfoot{
  background-color: blue;
  } 
tbody{
  background-color: yellow;
  }