Hi there, that’s why I asked for the url to your page if you were still having issues, then we could try and see in the source code what was causing the colour of the text to change etc.

Without seeing the page and how the code has rendered I can only suggest the additional css below to see if this could resolve the issue for you. The code below should render the text inside a standard shortcode button, as in the demo white without effecting the background colour. Let me know if that works for you.

.readmore a, input[type="submit"] {
color: #ffffff !important;
}