[BirdOPrey5]

The calendar background image is 60 x 60 pixels so enlarging it will show distortions in the image- and this was never designed to be enlarged.

But if you want to try it can all be done by adding code to additional.css - for example add this:

#bop5headcalmain {
  height:90px !important;
  width:90px !important;
  background-size: 100%;
}

That will make the calendar background image 90x90 instead of 60x60, but you will still need to do custom code for each of the text lines including the new custom widths and new font sizes, and new spacing in pixels (top values in CSS.)