Hey:
I do not know if it will totally work for you, but I would place a button in the top of the content area of the page. Then I would edit the button in HTML and assign an ‘id’.
<div class="wp-block-button"><a class="wp-block-button__link" href="https://localhost:9137/index.php/speakers/">LEARN MORE</a></div>
To:
<div id='hdr-button' class="wp-block-button"><a class="wp-block-button__link" href="https://localhost:9137/index.php/speakers/">LEARN MORE</a></div>
Now you can use CSS directly on the ‘id’. So, the following added to Custom CSS as follows:
#hdr-button {
position:absolute;
top: 80px;
right: 10px;
padding: 10px;
}
So this placed the button in the upper right corner. You can use a @media query for mobile.
Phil