How do I make all the fonts on my appointments+ calendar page the same?

Each snippet of shortcode gives me a different font on my calendar page, ie: "Please select a service" is the same font as "Please select a service provider", but they are inexplicably differing in size; "Our Schedule For November" is in a different, smaller, and all-cap font; and "click a free day to apply for an appointment" is in yet another font. I straight up copied-and-pasted the shortcodes; what do I need to do?