Letter Space

.btn-letter-space {
  display: inline-block;
  padding: 13px 28px;
  border: none;
  border-radius: 10px;
  background: #0f766e;
  color: #ffffff;
  font-family: inherit;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: letter-spacing 0.3s ease, background 0.3s ease;
}
.btn-letter-space:hover {
  letter-spacing: 0.22em;
  background: #0d9488;
}
.btn-letter-space:active {
  letter-spacing: 0.05em;
}