Change the Font Size

Can someone tell me how to change the size of the font in the site description?

I also need to know how to change the color of the title in the footer widget. I can’t seem to find where to do that

Hi,
you can try to add this code using custom css plugin:
change the font size of site description:

h2.site-description {
  font-size: 14px;
}

you can increase or decrease the value of font-size in above

and this to change the color of the footer titel:

.footer-widget-area .widget-title {
  color: #fff;
}

That worked for the font color in the footer, but the size of the font in the site description isn’t changing with the code you provided

How about this one?

.site-description {
  font-size: 24px !important;
}