Hi,
I personally opened 2 topics in this thread and there were 3 others, all were removed one hour ago ... what happened please ? Should I post new topic ?

Hi again, yes we are so sorry about that.
We have rebuilt our forum and lost the Template category "1st class".

We saw that you have posted a thread about the read more buttons.
But the read more buttons at our demo are made with a simple link like this:

<a href="#" class="uk-button button-default">More Details</a>

The basic read more at the Joomla article has no style and cant be styled, because they have no extra class.
But you can create an override for the read more link
Let's say you want to customize the layout of the content Joomla component. To do so, just copy the com_content directory from /warp/systems/joomla.1.x/layouts to the theme /layouts directory.
Further this way you won't lose any of your changes after an update of your theme. Make sure to only copy the files you want to change, all other layout files will be loaded automatically from the system defaults.