Catch Everest Tagline Color & Font Size

Hello, I'm trying to change the color and font size of the tagline on my site (But keep the site title and all others the same). When I use the "Additional CSS" option in the customizer, no changes appear. In searching in other topics here, the code I found is below, with my desired settings included. h2#site-description { color: #2c7f00; font-size: 24px; } URL is www.withinusolutions.com I have not been able to get any custom CSS to actually take effect in this site. Thank you in advance for any help.