react18-tools/react-mouse-trail

.btn {
  display: block;
  margin: auto;
  margin-bottom: 3rem;
  cursor: pointer;
  padding: 15px 20px;
  background: transparent;
  border-radius: 10px;
  color: var(--text-color);
  box-shadow: -2px 2px 8px var(--text-color);
}

.btn:hover {
  box-shadow: none;
}