Getting a RShiny Dashboard Output to Work on Different Size Screens

I am building a shiny dashboard. It looks great on my standard desktop monitor. However, the images don't fit on my 13-inch laptop. I suspect that the dashboard won't fit on many of the screens my clients will be using.
I am referring to actual dashboard elements. My charts scale to fit within their boxes, but I need a way to scale the boxes to the size of the display. I attached an example of what the Graphs look like on a 27 inches screen and 13 inch screen. $250