body {
  font-family: Arial, sans-serif;
  background: #f1f1f1;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

h1 {
  margin-bottom: 15px;
  color: #0077b6;
  justify-content: center;
  align-items: center;
}

#display {
  width: 100%;
  height: 40px;
  margin-bottom: 15px;
  text-align: right;
  padding: 5px;
  font-size: 18px;
  border: 1px solid #ccc;
  border-radius: 5px;
}

.botoes {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

button {
  padding: 15px;
  font-size: 16px;
  border: none;
  border-radius: 5px;
  background: #0077b6;
  color: white;
  cursor: pointer;
  transition: cubic-bezier(0.3s);
}

button:hover {
  background: #48cae4;
}

button:active {
  background: #023e8a;
}