body {
  background: #222;
  /* display: flex;
  justify-content: center; */
  margin-top: 50px;
  margin-left: 40%;
  align-items: center;
  height: 100vh;
  font-family: Arial, sans-serif;
}

.calculator {
  background:linear-gradient(rgb(94, 94, 238), rgb(83, 155, 238));
  padding: 20px;
  border-radius: 10px;
  width: 300px;
  border: 5px ridge #f0eded;
}

#display {
  width: 94%;
  height: 50px;
  font-size: 22px;
  text-align: right;
  margin-bottom: 10px;
  padding: 5px;
  border-radius: 10px;
  border: 5px ridge #9c9b9b;
  margin-right: 20px;
  background-color: azure;
}

.buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

button {
  padding: 15px;
  font-size: 18px;
  border: 3px groove #f0eded;
  cursor: pointer;
  border-radius: 5px;
}

button:hover {
  background: #ccc;
}

.zero {
  grid-column: span 3;
}
h4 {
  text-align: center;
  color: rgb(255, 255, 255);
  margin-top: 2px;
  text-transform: uppercase;
  text-shadow: 2px 2px 6px rgba(0, 0, 0, 0.4);
  
}