body{
    font-family: sans-serif;
    background-color: #f0f0f0;
}

h1{
    color: #333;
    text-align: center;
}

form {
    width: 300px;
    margin: 20px auto;
    padding: 20px;
    border: 1px solid #ccc;
    background-color: #fff;
    border-radius:30px;
}

label{
    display: block;
    margin-bottom: 5px;
}

input[type="number"] {
    width: 100%;
    padding: 8px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius:5px;
}

input[type="submit"] {
    background-color: #007bff;
    color: #fff;
    padding: 10px 15px;
    border: none;
    cursor: pointer;
    border-radius:5px;
}

.resultado {
    color: green;
    font-weight: bold;
}