W3.CSS Built-In Responsiveness
https://www.w3schools.com/w3css/w3css_responsive.asp
https://www.w3schools.com/w3css/tryit.asp?filename=tryw3css_responsive_half&stacked=h
https://www.w3schools.com/w3css/tryit.asp?filename=tryw3css_text_aligned
CSS Layout - Horizontal & Vertical Align
https://www.w3schools.com/css/css_align.asp
https://www.w3schools.com/css/tryit.asp?filename=trycss_align_container
