Remove the code for now:
https://chaturbate.com/accounts/editbio/
And then you have the z-index as a positive, set it to a negative so it's BEHIND the table of contents in future (starting point for most coding for websites, they use 0, 1, 2, or higher - so just a simple -1 will be fine, but -2 is even easier and better in this coding you have since you have it as z-index: 2, so just change it to z-index: -2
Code:
<img style="position: fixed; width: 100%; top: 0px; left: 0px; z-index: -2;" src="https://i.pinimg.com/736x/b9/48/8e/b9488e85e219d3dddef952dcaa946f6e.jpg">
(Make the coding cleaner by removing the "rel" and "target" attributes as i think most websites these days will have that code in so it automatically adds it for you, so it's not needed.
Also, it's good practice to add an "alt" attribute to any image you have in code, so if the image is a broken link, you an see exactly what image is broken
Code:
<img style="position: fixed; width: 100%; top: 0px; left: 0px; z-index: -2;" src="https://i.pinimg.com/736x/b9/48/8e/b9488e85e219d3dddef952dcaa946f6e.jpg" alt="Background">