body {
    font-family: Arial, sans-serif;
    margin: 20px;
}

h1 {
    color: #333;
}

form {
    margin-top: 20px;
}

input[type="text"] {
    width: 95%;
    padding: 8px;
    margin-bottom: 10px;
}

input[type="submit"] {
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    cursor: pointer;
}

input[type="submit"]:hover {
    background-color: #45a049;
}

.advertisement {
    display: block;
    border: 1px solid #ddd;
    padding: 10px;
    margin-bottom: 20px;
    text-align: center;
    text-decoration: none;
    color: inherit;
}

.advertisement:hover {
    border-color: #aaa;
}

.advertisement img {
    max-width: 100%;
    height: auto;
}