* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  width: 336px;
  height: 262px;
  overflow: hidden;
  background-color: #1a1a2e;
  color: #eee;
  font-family: system-ui, sans-serif;
}

#app {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

button {
  padding: 0.5rem 1rem;
  font-size: 1rem;
  background-color: #4a4a6a;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background-color: #5a5a7a;
}