Try this for your centering of the slider in your content editor:

<div style="width:50%; min-width:300px; text-align:center; margin: 0 auto;">[slider_gallery ids="3162, 3164"]</div>

If you wanted to align it to the right, then I would recommend using column shortcodes.

[column span="6"][/column][column span="6"][slider_gallery ids="3162, 3164"][/column]

Cheers!