Hillary Clinton on Sunday stuck to a low-key style to "officialize" her 2016 White House run, as had been widely expected. But at least in the Twitterverse, the Democratic frontrunner was not able to stir away from controversy, as many users were uneasy with a very visible part of her newly announced campaign: its logo.

The design -- a blocky blue "H" with a horizontal red arrow running through it -- reminded critics of a road sign pointing to a hospital, a tribute to the FedEx logo and, in the words of one commentator, "a promise to return our nation to the greatness of late 1970s NBC," Reuters noted.

"So what lucky 3rd grader won the Design the Hillary Clinton Campaign Logo contest?" quipped the Punditry, a Twitter critic with 14,000 followers. "Seriously, that Hillary Clinton campaign logo looks like it was made in (Microsoft) Paint," added Ryan Duff, according to Creative Bloq.

The design website found no fewer than five reason that, in its view, made the campaign logo questionable: Its similarities to well-known trademarks is undeniable; it resembles a hospital sign; the arrow signals a shift to the right; conspiracy theorists will have a field day with its "hidden messages"; and it is just downright "amateurish."

Linda Fowler, a political science professor at Dartmouth, told Reuters that although she thought Clinton's rollout was a success, the logo made her think of a hardware store.

"But maybe it's working," she told a journalist. "She's got you guys writing about her logo instead of her pantsuit and her hairstyle."

According to Brand New, a blog specializing in graphic design and typography, Clinton's logo was designed by Michael Bierut, an industry heavyweight and partner in the New York office of Pentagram, a studio that has developed packaging and products for companies such as Dell, Nike, Swatch and Tiffany, as well as corporate identities for Citibank and United Airlines.

Bierut's clients, meanwhile, have included Benetton, the Walt Disney Company, the Library of Congress, Motorola and the New York Jets. He served as the president of the American Institute of Graphic Arts from 1998 to 2001.