.ad { 
background-color: navy;
color:white;
border:2px solid black;
 }

ul {
background-color: navy;
color:white;
border: 2px solid black;

}

ul a:link{ 
color:white;}
ul a:visited{ 
color:white;}
ul a:hover{ 
color:white;}
ul a:active{ 
color:white;}

.center{
margin: 0 auto 0 auto;
text-align: center;
}