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Edit Suggestion Context menu layout

I’m using LT api on my website. And while using this code: Integration on Websites
I can easily run and check the textarea text and suggestion context menu.
I want to change the textarea styling and the dropdown(suggestion context menu).
I have another solution that If I click on check data and get result in JSON format and show it in my own context-menu.
Let me know that How can i use my own textarea and contextmenu with styling or can edit the API textarea & Menu.
Here’s my website layout: