NOTE: I’m using the Classic Editor.
In the TEXT side of your editor proper, put this.
<p style=”text-align: center;”>[read more]</p>
You can also simply select it in the normal editor and align center.
Additional ..
<div class=”darkblue-backing-cover”>
// I’m also using a css class – placed inside styles.css, and this is it if you want to play:-
.darkblue-left-backing-cover { padding: 6px 12px 12px 12px; background: #02003e; color: #808080; border-radius: 0 20px 20px 20px; border-style: solid; border-color: #02003e; }
.. Your hidden TEXT goes here..
// end up with the closing div at the end.
</div>
[/read]
// And of course your closing read more tag.
To reiterate: to achieve all of this, you have to work in the TEXT Side of the CLASSIC Editor, I don’t use Guttenberg, so I’ve no idea how it works over there.
Hope it helps ..