Try the asis=on style attribute. From the ODS documentation:
ASIS=ON|OFF
specifies how to handle leading spaces and line breaks in an HTML document.
ON
prints text with leading spaces and line breaks, in the same manner as the listing output.
OFF
trims leading spaces and ignores line breaks.
Default: OFF
Tip: The ASIS= attribute is valid only in MARKUP family destinations, PRINTER family destinations, and the RTF destination.
http://support.sas.com/documentation/cdl/en/odsug/59523/HTML/default/a002972093.htm#a002576191
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