Set the graphics environment for the Web page. DEV= specifies the HTML device driver, which will create the HTML and GIF files needed for the Web page. GSFNAME= specifies the libref that points to the storage location that was allocated for the Web output. XPIXELS= and YPIXELS= define a size in pixels for the graphics area. TRANSPARENCY specifies that the background areas in all generated graphs should appear to be transparent when the images are displayed in a browser. 
/* set the graphics options for the web page */ 
goptions dev=html gsfname=webout
          xpixels=450 ypixels=400
          transparency;