.header-button {
  font-size: 1.5em !important;
}

@media (min-width: 950px) {
  .navbar-default .menu > li > a {
    padding: 15px 20px !important;
    font-size: 1em !important;
    letter-spacing: 2.5px !important;
  }
}

@media (min-width: 768px) and (max-width: 949px) {
  .navbar-default .menu > li > a {
    padding: 15px 15px !important;
    letter-spacing: 1px !important;
  }
}