div.relation{
  margin-top: 20px;
}

div.relation a{
  padding: 5px 8px;
  border: 1px solid #2196f3;
  border-radius: 5px;
  color: #2196f3;
  transition: .4s;
  margin: 5px;
  display: inline-block;
}

div.relation a:hover{
  background: #2196f3;
  color: white; 
}