Biswajeet is my Name, Success is my Aim and Challenge is my Game.
Risk & Riding is my Passion and Hard Work is my Occupation.
Love is my Friend, Perfection is my Habit and Smartness is my Style.
Smiling is my Hobby, Politeness is my Policy and Confidence is my Power.
Due to some issue in Salesforce lightning css, helpText is not displaying properly in lightning out. Using following styles in your visualforce page, you can display the helptext properly.
Here I have created a custom detail button(New Contact) on Account object with some pre-populated Contact field values from Account record using Lightning URL Hacking.
Go to setup | Object Manager | Account | Buttons, Links, and Actions | Create a new Button