Customization for my 404 page

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I'm trying to change my 404 text to white.  I was able to add an image as my background, which is nice, but now the text doesn't show up.
I'd also love to be able to change the text if at all possible...
TIA for your help!

This is the page:

This is my current 404 code:

<!-- /templates/404.liquid -->
<div id="four-oh-four" class = "text-center">
<h1 >{{ 'general.404.title' | t }}</h1>
<p>{{ 'general.404.subtext_html' | t }}</p>
<a href="{{ routes.root_url }}" class="btn" >{{ 'general.404.button_text' | t }}</a>