CSS Reflow WCAG 2.1

I am using the WordPress Twenty Twenty theme and can not get my layout to reflow to meet Success Criterion 1.4.10 Reflow (Level AA): Content can be presented without loss of information or functionality, and without requiring scrolling in two dimensions for:

Vertical scrolling content at a width equivalent to 320 CSS pixels;
Horizontal scrolling content at a height equivalent to 256 CSS pixels.

When my screen is smaller than 800 pixels scrolling is required to view content. My paragraphs will not wrap text and my images are not responsive. I have tried media queries with numerous CSS override tricks such as FlexBox, word-break, word-wrap, and have played with margin adjustments but nothing is doing the job. If someone would please help me understand how I can adjust my CSS to achieve reflow to meet my very important WCAG 2.1 standard. Thank you.

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