Please always provide a link to your page so we can be sure of what is there.
Not sure why you are using blockquote, but the code below stays indented by 30px all the way through mobile
Regular text
<ul style=”padding-left: 30px;”>
<li>copy</li>
<li>copy</li>
<li>copy</li>
</ul>
So if it does not for you, we need to see the page