To use Gayathri in web pages, webfonts can be used. You may copy the following css and add to your website:

              
              
@import url('https://smc.org.in/fonts/gayathri.css');
              
html { font-family: 'Gayathri', sans-serif; }
              
            

Gayathri is also available in Google fonts. Using Gayathri from Google webfonts may be faster than the above approach. Please refer google fonts documentation for Gayathri