* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Noto Sans Display', sans-serif;
}

body {
  background-image: url("../img/fondo.jpg");
  background-repeat: no-repeat;
}

/* Formulario de cálculo  */
.form-calculo {
  background: #0073cd;
  width: 400px;
  padding: 30px;
  margin: auto;
  margin-top: 50px;
  margin-bottom: 10px;
  border-radius: 5px;
  box-shadow: 7px 10px 37px #000;
}

.form-calculo h4 {
  color: white;
  margin-bottom: 5px;
}

.numbers {
  background: #0073cd;
  width: 100%;
  padding: 10px;
  margin-top: 10px;
  margin-bottom: 10px;
  border: solid 1px white;
  border-radius: 8px;
  text-align: center;
  color: white;
}

.form-calculo ::placeholder {
  color: white;
}

button {
  width: 50%;
  padding: 10px;
  border-radius: 5px;
  border: solid 1px transparent;
  margin-top: 20px;
}

button:hover {
  background: #0073cd;
  border-color: white;
  color: white;
  cursor: pointer;
  transition: background .5s ease-in-out;
}

.boton-calcular {
  text-align: center;
}

.resultado {
  margin-top: 10px;
  color: white;
}

label {
  color: white;
}

/* Responsive design */
@media screen and (max-width: 500px) {
  .form-calculo {
    width: 90%;
  }
}