css - Allign div with margin-left and margin-right -

css - Allign div with margin-left and margin-right -

i have div element css this

div.details { float:right; margin-right:50px; margin-left:50px;

}

however keeps margin right. how can align div 50px both left , right

you can like:

div.detais{ margin:0 auto; }

or can more specific , here.

css html5