Text Overlay to Slider-Wide Image

Hi guys, a few have posted similar to this before including me but I just wanted to ask the question much clearer;

Can anyone advise on adding text over the top of an image that is added to the slider wide widget?

The objective is to have text that is real text, not just text in an image, at the top of my page in the slider wide widget, with an image behind it.

Preferably, as the image reduces depending on the device, so would the text size as well.

Thanks