How to apply css in Oracle APEX

In this video, I will change the tab list and 3 item background color using different solution
1) Put the code to the page inline:
.t-Tabs { background-color: coral;！important }
#P7_C_LABEL{background-color: green;}
.Item_Color{background-color: red;}
t-Tabs is the tab class name
P7_C_LABEL is the id of page item P7_C
Item_Color is written by myself
2) put the CSS Name to page item P_C2
Advanced：
CSS:
Item_Color
3）put the code to the page item P7_C3
Advanced
Customer Attributes
style="background-color: yellow;"

[@wendyliu5221]

Very helpful tips never found anywhere else. Good job!

[@weililiu2119]

Awesome, thank you!

[@SallyXu-ot3ch]

Good job! Keep it going ！👍👍👍

[@weililiu2119]

Thank you 😊

[@ahmedharoon2740]

very nice for beginners like me... what about if i have all item's static id and use specific style(s) for specific item, how i can refer them in inline CSS ? thanks.

[@6222453]

国人apex 教程。 👍 可不可以出个怎么用js 添加css

[@weililiu2119]

好的，我会考虑，谢谢