jQuery HTML: Given the following HTML: <!DOCTYPE html> < html lang = " en " > < head > < meta charset = " UTF-8 " > < meta name = " viewport " content = " width=device-width, initial-scale=1.0 " > < title > jQuery </ title > < link rel = " stylesheet " href = " styles.css " > </ head > < body > < h1 class = " big-title " > Hello </ h1 > < button > Click Me </ button > < button > Click Me </ button > < button > Click Me </ button > < button > Click Me </ button > < button > Click Me </ button > < script src = " https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js " > </ script > < script src = " index.js " charset = " UTF-8 " > </ script >...