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

body {
  font-style: sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.calculator-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
  background-color: lightgrey;
  border-radius: 2px;
  padding: 0.5rem;
}

.display {
  grid-column: span 4;
  display: flex;
  align-items: center;
  justify-content: right;
  background-color: white;
  padding-right: 0.5em;
  border: 1px solid black;
  border-radius: 4px;
  height: 2rem;
}

.btn {
  all: unset;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: white;
  border: 1px solid black;
  border-radius: 4px;
  padding: 0.5rem;
  cursor: pointer;
  transition: background-color 0.5s;
}

.btn:hover {
  background-color: #ddd;
}