Changing font size in customizer

Hi, I tried to change some font sizes in Customizer, but it doesn’t work in the page, for instance t H3 header of the widgets.

Is ther a solution fot this?

Hi Alfred,

sorry for the inconvenience but I think there is something missing in the theme.
you can add this code using custom css plugin to resize the font size:

h3 {
  font-size: 28px !important;
}

for an example, you want the H3 header title has font size 28 pixel.