Depending on your destination of choice (HTML, RTF, PDF), you CAN get a left-justified image by taking the image out of the CSS file and moving it into a title statement, using ODS ESCAPECHAR:
[pre]
ods html file='leftlogo.html' style=sasweb;
ods escapechar='~';
title j=l '~S={preimage="http://www.wombat.com/logo.gif"} ' j=c 'Rest of Title';
proc print data=sashelp.class;
run;
ods html close;
OR
title1 j=l '~S={preimage="http://www.wombat.com/logo.gif"} ' ;
title2 j=c 'Rest of Title';
[/pre]
You may or may not like the way it looks -- you don't have as much control over sizing as you do with CSS and you have to specify the preimage location differently for HTML vs RTF and PDF:
HTML = where the image will be when the HTML page is loaded by the browser
RTF/PDF = where the image will be when the RTF/PDF file is CREATED
But this might be an alternative for you. Note that the ODS ESCAPECHAR that you declare in the ODS ESCAPECHAR statement must be the same one that you use in the TITLE statement (in my example, I use the tilde ~).
cynthia