.btn-border_ab {
  display: inline-block;
  text-align: center;
  background-color: #499AB2;
  border: 1px solid #499AB2;
  font-style: normal;
  font-size: 15px; 
  color: #ffffff;
  text-decoration: none;
  font-weight: 400;
  padding: 0.5em 1.5em 0.4em 1.5em;
  border-radius: 4px;
  transition: .3s;
}

.btn-border_ab:hover {
  background-color: #ffffff;
  border-color: #499AB2;
  color: #499AB2;
}