I have create a new theme to add a button with custom css and js to the home webpage, everything works good after installing it but when I try to remove the theme nothing seems to happen, the button still remains on the home page.

How should I remove the theme if I do not want to continue using it on that website, should I use a module instead of theme?

Here is the xpath that I am using to insert the button using the theme, I am inheriting from website.layout:

<xpath expr="//div[@id='wrapwrap']/header/nav" position="after">                 

<div class="container">               

<div class="text-center">                  

<button class="btn btn-lg btn-primary rounded-circle rounded-circle rounded-circle rounded-circle" data-original-title="" title="" aria-describedby="tooltip747788" data-toggle="modal" data-target="#exampleModalLong"> New <i class="fa fa-plus-circle" />                  

</button> 

 </div>            

</div>         

</xpath>
​

Thank you