Each Replo page has it's own file. Replo page's code is automatically updated when a change is made to it in Replo editor. This will overwrite any changes to the file itself!
Instead, you can insert custom HTML/Liquid in the Replo editor.
Head tag
You can head to the page configuration:
Then choose the advanced tab and add your codes on the field below.
If you need to add JavaScript, use <script> tags, if you need to add CSS, use <style> tags.
The codes will sit on the <head> tag of your page HTML.
Body tag
You can add to your page (via drag/drop) an HTML or Liquid component (depending on what you need), these components will sit on the body tag of your page HTML.
You can find mentioned components, here:
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Learn more about both components, here: https://support.replo.app/hc/en-us/articles/17196208191117-Custom-HTML-and-Liquid