body {
  font-family: Arial, sans-serif;
  background-color: #232323;
}

h1 {
  text-align: center;
  margin-top: 30px;
  color: #ddd;
}

.calculadora {
  width: 314px;
  margin: 0 auto;
  background-color: #fff;
  padding: 20px;
  border-radius: 5px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1); 
}

.teclado{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

#pantalla {
  box-sizing: border-box;
  width: 100%;
  padding: 10px;
  font-size: 20px;
  margin-bottom: 10px;
  text-align: right;
}

input[type="button"] {
  height: 50px;
  font-size: 18px;
  background-color: #eee;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

input[type="button"]:hover {
  background-color: #ddd;
}

.btn-c{
  grid-column: span 2;
}
input[type="button"].btn-c {
  background-color: #ff6666;
  color: white;
 }