.calculator {
  border: 2px solid #ddd;
  border-radius: 5px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  width: 100%;

}

.display {
  background: #333;
  color: #fff;
  font-size: 2em;
  padding: 10px;
  text-align: right;
}

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

.btn {
  border: 1px solid #ddd;
  background: #fff;
  font-size: 1.5em;
  padding: 20px;
  cursor: pointer;
  transition: background 0.3s;
}

.btn:hover {
  background: #f0f0f0;
}

.btn:active {
  background: #ccc;
}
#clear{
  background-color: #FF4500;
}
#equals{
  width: 100%;
  background-color: #FF4500;
}
#plus, #minus, #divide, #times{
  background-color: teal;
}