background: black;
color: #ffffff;
border: 1px solid rgba(255,255,255,0.10);
letter-spacing: 0.18em;
text-transform: uppercase;
font-weight: 300;
.btn-premium {
  background: #000000;
  color: #000000;
  border: 1px solid #ffffff;
  padding: 16px 32px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

.btn-premium:hover {
  background: transparent;
  color: #000000;
}