To solve that, you have to move from the easier static made-for-one-width design (what we think of as desktop-first design) and move to fluid, reflowable design

To solve that, you have to move from the easier static made-for-one-width design (what we think of as desktop-first design) and move to fluid, reflowable design which we tend to call mobile-friendly design. Unfortunately, it tends to take more thought because we usually want widescreen components, like sidebars, that are easier to build when you can hard-code a device width, and hard-coding width is what breaks zooming and text size changes.