app/static/style.css

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f8f9fa;
}

.container {
    width: 600px;
    margin: 50px auto;
    background: #ffffff;
    padding: 20px;
    box-shadow: 2px 2px 12px #aaaaaa;
}

h1 {
    text-align: center;
    margin-bottom: 20px;
}

form {
    display: flex;
    flex-direction: column;
}

label {
    margin-bottom: 5px;
}

input[type="text"] {
    padding: 10px;
    margin-bottom: 10px;
}

button {
    background-color: #4285f4;
    color: white;
    padding: 10px;
    border: none;
    cursor: pointer;
    width: 150px;
}

button:hover {
    background-color: #3367d6;
}

#result {
    margin-top: 20px;
    font-size: 18px;
}