responsive design - Auto Fit inner div grid to outer column and

I have an image gallery that is overflowing its containing div. I have tried various solutions to no avail. What CSS code approach will fit the grid to the fixed-height outer div, including making

Responsive Layout without Media Queries

Basic concepts of grid layout - CSS: Cascading Style Sheets

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How to make your HTML responsive by adding a single line of CSS, by Per Harald Borgen, We've moved to freeCodeCamp.org/news

Realizing common layouts using grids - CSS: Cascading Style Sheets

A Complete Guide to CSS Grid

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