body {
    font-family: Arial, sans-serif;
    padding: 20px;
    background: #f7f7f7;
}

.container {
    background: white;
    border: 1px solid #ccc;
    padding: 20px;
    max-width: 400px;
    margin: auto;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h2 {
    text-align: center;
}

#inputString {
    width: 100%;
    padding: 6px;
    margin: 10px 0;
}

button {
    padding: 6px 12px;
    cursor: pointer;
}

#result {
    margin-top: 15px;
    white-space: pre-line;
}