Send html Email Google

function mymail() {

var html=
"<style>"
+"body {"
  +"font-family: sans-serif;"
 +" background: lightyellow;"
  +"text-align: center;"
 +" margin-top: 20px;"
+"}"

+"progress {"
  +"display: block;"
  +"margin: 0px auto 40px auto;"
+"}"

+"label {"
  +"margin-top: 30px;"
+"}"

 +" </style>"



+"<label for='indeterminate'>alessandro.barazzuol@liceoconegliano.it:</label><progress></progress>";
MailApp.sendEmail({to:"xxxxxxx",subject:"ciao",htmlBody:html});

}