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

A Very, Very In-Depth Guide on CSS Grid - CoderPad

Column layouts - CSS: Cascading Style Sheets

Building Responsive Layouts With CSS Grid: A Step-By-Step Guide

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Positioning elements with Grid - Dawntraoz

You don't need a media query for that — #2 Responsive Columns, by Mandy Michael

javascript - Responsive centering in dense grid layout with repeat auto-fit - Stack Overflow

Guide to creating responsive web layouts with CSS grid - LogRocket Blog

Grid

Guide to creating responsive web layouts with CSS grid - LogRocket Blog

Box alignment in grid layout - CSS: Cascading Style Sheets

CSS Grid Layout Module Level 2

CSS Grid: Auto-fit behaving like Auto-fill when using grid-column-start/end - Stack Overflow