styles.css

body {
  margin: 0;
  height: 100vh;
  background-color: #dadff7;
  display: flex;
  justify-content: center;
  align-items: center;
}

main {
  display: grid;
}

.calculator {
  width: 400px;
  height: 100%;

  background-color: #071013;
  border-radius: 10px;
  color: #ffffff
}

.display {
  width: 360px;
  margin: 10px;
}

.display input {
  width: 100%;
  padding: 15px 10px;

  text-align: right;
  border: none;
  background-color: linen;
  font-size: 35px;
  border-radius: 10px;
}

.buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 5px;
  padding: 10px;

}

.buttons button {
  font-size: 2rem;
  font-weight: bolder;
  background-color: #313131;
  color: white;
  height: 95px;
  border-radius: 10px;
}

.dcol {
  grid-column: span 2;
}

.buttons button.operator {
  border-color: #dadff7;
  background-color: #555454;
}