automator fifa 19 web app
This should work for you

tell application "Safari"
    activate
    do JavaScript "document.getElementsByClassName('btn-standard')[0].click();" in document 1
end tell




When in doubt, You can always use APPLESCRIPT MAKER  Which will create the correct JavaScript for you

I'm not really sure because I never use Safari but maybe enabling "Allow JavaScript from Apple Events" Needs to be enabled?