Change top panel font in Ubuntu 19.04

In Default Ubuntu 19.04

the User Shell Theme is /usr/share/gnome-shell/theme/Yaru/gnome-shell.css

If you want to use your own shell theme, you need to install user-shell theme. https://extensions.gnome.org/extension/19/user-themes/

If you are using the default one,

open the file /usr/share/gnome-shell/theme/Yaru/gnome-shell.css and edit the content like below. Please note that I have already added the line font-family: Arial, Helvetica, sans-serif; in below content.

/* TOP BAR */
    #panel {
      background-color: #1d1d1d;
      font-weight: 450;
      font-family: Arial, Helvetica, sans-serif;
      height: 1.86em;
      font-feature-settings: "tnum"; }

for Example: In the belwo .gif I have changed the top bar font from "Keraleeyam" to "Dyuthi"