body{ 
 background-color:burlywood 
 } 
 .navigation1 
 { 
 float:left; 
 background-color:blue; 
 color:white; 
 width:20% 
 } 
 .navigation2 { 
 float: left; 
 background-color:chartreuse; 
 color: white; 
 width:60% 
 } 
 .navigation3 { 
 float: left; 
 background-color:gold; 
 color: white; 
 width: 20% 
 } 
 @media only screen and (max-width:500px) { 
 .navigation1,.navigation2, .navigation3 { 
 width: 100%; 
 background-color:black; 
 border:2px solid white 
 } 
 }