SAN FRANCISCO (AP) -- Web surfing through the Internet's main gateway now looks slightly different on personal computers, thanks to a few cosmetic changes to Google's search engine this week.The tweaks to the way Google's search results appear on desktop and laptop computers mirror a makeover on smartphones and tablets introduced a few months ago.The new presentation increases font sizes and removes the underlines below the blue links of each search result on PCs. Ads appearing along the top and the right-hand panel of the results page no longer are presented in boxes shaded in blue and yellow. The marketing pitches are now marked by small ad tags to distinguish them from the rest of the results.Google Inc. rolled out the new design on PCs with little fanfare, even though it will be seen by almost everyone who searches for information on personal computers. That's because Google processes about two out of every three search requests made on PCs.The company's lead search designer, Jon Wiley, announced the makeover Wednesday with a post on his Google Plus page.The changes are meant to make it easier to scroll through Google's search results and present a \cleaner look