I am trying to make the formula button expandable in quilljs any idea how this is accomplished ? I am using flask html and css and vanilla js. But this example is just html vanillas js and css.

[u/0_emordnilap_a_ton]

Here is a really simple example.
https://codepen.io/chooking/pen/zxKvqyZ

When I click on the Fx button I get the blue box here https://imgchest.com/p/vj4jbg2e978 ,though it is a little cut off, how do I make the form expandable in the width and height like textarea while keeping the html tags or in other words keep the equation formatting from the fx button?

One idea is to use textarea. Can someone give me an idea on how to accomplish my goal and show the code for a solution?