Thanks for your suggestion. I can see two coloumns in Checkout page after disabling the Cache Plugin.
Now let me know if i can adjust both coloumn width ?
If you see the current status (https://www.socialmedia37.com/checkout/) the page content is exactly in centre. There is a hug space remaining from both side (left-right)
Let me know if you can help me customize the checkout template like i mention above.