[HELP] How can I center these pricing boxes and order them by price?

I am new to WordPress and website building in general.

I am attempting to center these boxes in the middle of the page, but they only appear centered if I have 4 in a row. When I have 3 in a row (like this: http://ift.tt/1Tc2IMY) they sit to the left.

 

The boxes come from the pricing section. and I am using a text block with this in the content section:

[tg_pricing columns="4" items="4" category="dusk-photo-standalone" orderby="title"] 

 

I have tried adding this to the code:

<div style="text-align:center">[tg_pricing columns="4" items="4" category="dusk-photo-standalone" orderby="title"]<div 

But that only caused more problems (screenshot: http://ift.tt/1O36CYl )

 

I am also at a loss on how to order my other row by price. orderby="title" seems to work but price would be very handy.

I have only put "background: #f8f8f8;" in the custom CSS field for this text block. To make the background grey. Theme used is PROXIMA theme.

Assistance is greatly appreciated!

Epic visual tool

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