Sticky element disappears at bottom of parent div · Issue #31 · leafo/sticky-kit · GitHub
html - How to align a label to the "BOTTOM" of a div in CSS? - Stack Overflow
html - CSS Align top of child container to bottom of parent container - Stack Overflow
Position a child div relative to parent container in CSS
How to make a flex div contained an image without expanding beyond the image dimensions - HTML & CSS - SitePoint Forums | Web Development & Design Community