body {
  background: #277de03c;
  display: flex;
  height: 100vh;
  justify-content: center;
  align-items: center;
}

.calculator {
  background-color: #222;
  padding: 25px;
  border-radius: 20px;
  box-shadow: 0 8px 16px rgba(34, 105, 172, 0.528);
  width: 300px;
}

#display {
  width: 100%;
  height: 60px;
  font-size: 30px;
  text-align: right;
  padding: 7px;
  border: 2px solid #446;
  border-radius: 11px;
  margin-bottom: 30px;
  background-color: #ffffff;
}

.buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 7px;
}

button {
  padding: 25px;
  font-size: 20px;
  border: solid #333;
  border-radius: 8px;
  background-color: #444;
  color: rgb(248, 248, 248);
  cursor: pointer;
}