Cannot highlight or bring up text span if text is in a slider?

Hi, unable to highlight or style text in a subheading? I can type what I want but cannot highlight the text. Is this because it’s in overflow?

https://preview.webflow.com/preview/untitled-997d82?utm_medium=preview_link&utm_source=designer&utm_content=untitled-997d82&preview=4a601a70f5bc7a97a154d80e27210695&mode=preview


Here is my site Read-Only: LINK
(how to share your site Read-Only link)