body {
  font-family: Arial, sans-serif;
  background-image: url(/img/pared-fondo.jpg);
}

h1 {
  text-align: center;
  margin-top: 30px;
  font-size: 40px;
}

h2 {
  text-align: center;
  margin-top: 10px;
  color: #dddddd;
  font-style: italic;
  text-decoration: underline;
}

.calculadora {
  width: 350px;
  margin: 0 auto;
  background-color: hsla(0, 78%, 23%, 0.743);
  padding: 20px;
  border-radius: 10px;
  box-shadow: 3px 10px 20px rgba(0, 0, 0, 0.688);
}
@media (max-width: 410px) {
    .calculadora {
      width: 85%;
    }
    .display {
      width: 85%;
    }
}
.display {
  width: 100%;
  display: flex;
  justify-content: center;
}
#pantalla {
  width: 90%;
  height: 30px;
  padding: 10px;
  font-size: 25px;
  margin-bottom: 10px;
  text-align: right;
  border-radius: 8px;
}

input[type="button"] {
  width: 70px;
  height: 40px;
  margin-bottom: 10px;
  font-size: 17.5px;
  font-weight: 500;
  color: white;
  background-color: #0000005b;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

input[type="button"]:hover {
  background-color: #0000008e;
}

input[type="button"]:last-child {
  margin-right: 0;
}

.cuadrilla {
  display: flex;
  justify-content: center;
  
}
.columna {
  margin: 0 7px;
}

.btn-borrar {
  display: flex;
  justify-content: center;
}
.btn-borrar input {
  margin: 0;
  min-width: 100px;
  background-color: #00b3ff5b;
}
.btn-borrar input:hover {
  background-color: #00b3ff92;
}

#btn-igual {
  background-color: #00ff9d5b;
}
#btn-igual:hover {
  background-color: #00ff9d93;
}