Update styles to fix the image resolution on smaller devices

Editor assessment

The subject describes a visual fix, styles adjusted so images resolve correctly on smaller devices, but 'image resolution' is ambiguous between rendering size and actual resolution, and no body disambiguates or names the broken property, so the diff is required. Fix is right. No scope, no footers. The trailing pull-request number is the conventional squash-merge marker. Hygiene is fine: imperative shape, no trailing period, no junk, moderate length. Understandable at the level of intent and vague at the level of mechanism.