Word allows you to optimize your Web pages for specific screen resolutions and pixel densities:

• Click Tools | Options | General | Web Options.
• Select the Pictures tab and adjust the Screen Size and Pixels Per Inch settings for your optimum monitor. By default, Word uses an 800 x 600 resolution at 96ppi (assuming a relatively small monitor).
• If you wish to support higher resolutions, Word allows up to 1,920 x 1,200. If your monitor is somewhat larger, opt for a lower pixel density to fill the larger visual area (even at higher resolutions).