.linkb:link, .linkb:visited {
  background-color: black;
  color: white;
  padding: 10px 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  border-radius: 5px; 
  
}

.linkb:hover, .linkb:active {
  background-color: silver;
  color: black;
border-color:black;

}