Bootstrap's CSS is built on Less, a preprocessor with additional functionality like variables, mixins, and functions for compiling CSS. Those looking to use the source Less files instead of our compiled CSS files can make use of the numerous variables and mixins we use throughout the framework.
Oysters contain more zinc per serving than any other food, but red meat and poultry provide the majority of zinc in the American diet. Other good food sources include beans, nuts, certain types of seafood (such as crab and lobster), whole grains, fortified breakfast cereals, and dairy products [2,11].
Protein-rich beef, turkey, chicken, shrimp, lobster and fish are all excellent sources of both zinc and selenium. For example, 3 ounces of beef provides about 7 milligrams of zinc and 33 micrograms of selenium, while 3 ounces of chicken contains about 2.4 milligrams of zinc and 22 micrograms of selenium.