body {
  background-color: white;
  color: black;
  font-family: Verdana;
}
header {
    background-color: #ffffff; 
    color: #000000;        
    padding: 20px;             
    text-align: center;       
}

header a {
    color: #000000;           
    text-decoration: none;     
    margin: 20px;  
    text-align: center;
}