sb-test-clicker/src/components/button.css

npm install

button {
  min-width: 140px;
  font: inherit;
  border: none;
  color: white;
  background-color: steelblue;
  border-radius: 4px;
  padding: 12px 22px;
  cursor: pointer;
}

button:focus {
  outline: none;
}