body {
    font-family: Arial, sans-serif;
    background-color: lightblue;
    text-align: center;
}

.contenedor-principal {
    background-color: white;
    width: 80%;
    margin: auto;
    border: 4px solid darkblue;
    padding: 20px;
}

h1 {
    color: red;
    text-decoration: underline;
}

.imagen-formula {
    width: 300px;
    border: 2px solid black;
}

.campo {
    margin: 15px 0;
    font-weight: bold;
}

input[type="number"] {
    padding: 5px;
    border: 2px solid grey;
}

button {
    padding: 15px 30px;
    background-color: green;
    color: white;
    font-size: 18px;
    border: 3px solid black;
    cursor: pointer;
}