#series_area, #introduce_area, #question_area, #etc_area {display:none;}

main.udemy div[data-role='tab_menu'] {padding-top:0;}
main.udemy div[data-role='tab_menu'] ul.tab_wrap {visibility:hidden;}

main.udemy > div.list div.breadcrumb > a.share {margin-right:0;}
main.udemy > div.context {padding-bottom:40px;}
main.udemy > div.context > div.container div.intro div.etc {padding-bottom:20px; font-size:15px;}