The default graph size
for the SVG output is 800 x 600 pixels. You can change the size of
your graph with the HSIZE= and VSIZE= graphics options. You can change
the paper size by specifying the XMAX= and YMAX= or the XPIXELS= and
YPIXELS= graphics options. Specifying a value for the XMAX=, YMAX=,
XPIXELS=, or YPIXELS= graphics options changes the setting of the
PAPERSIZE= system option.
See SAS System Options and SVG Output and Graphics Options and Device Parameters Dictionary.