The clear link button inside the link dialog box is invisible.

Steps to reproduce:

Install Ibexa DXP latest 3.3

Create or edit an article. Inside a rich text bloc,  type a text select it in order to put an external link on it

Fill the "Link to"  field by providing an extrernal url

You can observe that the clear link button is not visible.(see attached)

Expected result:

The clear button should be visible when there is key event in the "Link to" input field