css - Table not always horizontally centered -

i trying insert table in page following code of this page.

here my jsbin.

the problem when enlarge output window, table moves left rather keeping in center:

does know how keep table in center horizontally?

additionally, know how control width each column in css?

change .feature-table

.feature-table {   color: #818181;   margin: 0 auto; } 

in example works fine, example