body {
  font-family: Arial, Helvetica, sans-serif;
  background-color: #f0f0f0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

.container {
  text-align: center;
  background: #fff;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

#rollBtn {
  padding: 0.5rem 1rem;
  font-size: 1rem;
  cursor: pointer;
}

.result {
  margin-top: 1rem;
  font-size: 3rem;
  font-weight: bold;
}