In the old Xanga I can create a custom css, in which I placed these entries:

#pl {float:left;padding-left:20px;padding-right:20px;padding-top:20px;padding-bottom:20px;}
#pr {float:right;padding-left:20px;padding-right:20px;padding-top:20px;padding-bottom:20px;}

This would allow me to align a picture either to the left or the right of the post and the words will flow around it.

How do I recreate the css again?

Thank you