html - centre horizontally within parent -


on this page show list of artists appearing @ festival. placement of artist <div>s controlled isotope (it difficult lineup using css alone when there large number of artists , artist divs different heights).

anyway, centre artist divs within parent container there's equal amount of white space left , right of artists, illustrated below.

enter image description here

i've tried obvious things like:

margin: 0 auto text-align: center

but no luck far....

the parent must have 

text-align:center; width:abc;

and width. child should have 

margin:auto; text-align:left; width:xyz;

example:

<div style="width:100%; text-align:center;">     <div style="width:50%; text-align:left; background:red; margin:auto;">         right     </div> </div>

if not work, should check if else influences behavior!


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