Please see attached.
Please use Bootstrap 4 or regular CSS3 (no framework). Some of the screens that should be visible on web should slide over when buttons are pushed on main screen. (If that's not clear from the diagram, please ask questions.)
The diagram also contains full resolution PNG's, so please use those as the base level design.
Please use normal CSS rules, gradients, HTML divs, etc. Please use rem units only: no px, no em; only percentages and rem.
For the bottom or left toolbar, please use either absolute positioning (that is: right:0; left:0, bottom:0, height:3rem)
This should result in a single HTML file with some jQuery and CSS. That's what we're looking for. Please, no angular, vue, react, etc. (That will come later.)
You can provide it in a webpack or gulp node application, if that is easier for you. Jade templates are ok as well, or just plain HTML. SCSS is ok as well, or just plain CSS.
Thank you for looking at this project!