body {
    font-family: Arial, sans-serif;
    text-align: center;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
}

.contenedor {
    width: 50%;
    margin: auto;
    background: white;
    padding: 20px;
    box-shadow: 0px 0px 10px gray;
    border-radius: 10px;
    margin-top: 50px;
}

button {
    padding: 10px 20px;
    margin: 10px;
    border: none;
    background: #28a745;
    color: white;
    font-size: 16px;
    cursor: pointer;
    border-radius: 5px;
}

button:hover {
    background: #218838;
}

input {
    padding: 10px;
    font-size: 16px;
    width: 80%;
    margin: 10px 0;
    text-align: center;
}

#resultado {
    font-weight: bold;
    font-size: 18px;
    margin-top: 10px;
}

#solucion {
    font-size: 18px;
    color: blue;
    margin-top: 10px;
}