Neo Dark

.btn-neo-dark {
  display: inline-block;
  padding: 13px 28px;
  border: none;
  border-radius: 14px;
  background: #24262b;
  color: #b8bcc6;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 8px 8px 16px #1b1d21, -8px -8px 16px #2d2f35;
  transition: box-shadow 0.2s ease, color 0.2s ease;
}
.btn-neo-dark:hover {
  color: #e2e5ea;
  box-shadow: 5px 5px 12px #1b1d21, -5px -5px 12px #2d2f35;
}
.btn-neo-dark:active {
  box-shadow: inset 5px 5px 10px #1b1d21, inset -5px -5px 10px #2d2f35;
}