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

header {
    background-color: #333;
    color: #fff;
    padding: 1em 0;
    text-align: center;
}

main {
    padding: 20px;
}

form {
    background: #fff;
    padding: 20px;
    margin: 20px 0;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

form label {
    display: block;
    margin: 10px 0 5px;
}

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

form button {
    padding: 10px 15px;
    background-color: #333;
    color: #fff;
    border: none;
    cursor: pointer;
}

form button:hover {
    background-color: #555;
}

ul {
    list-style-type: none;
    padding: 0;
}

ul li {
    background: #fff;
    padding: 10px;
    margin: 5px 0;
    border-radius: 4px;
}

.result {
    background: #fff;
    padding: 20px;
    margin: 20px 0;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}