Prebuilt mixins
You already know about searching and finding mixins on the Web. However, using and reusing well-tested mixins will be a lot easier than that. Other developers have already built complete libraries and prebuilt mixins which you can use for your projects. These prebuilt mixins help you write Less code without having to think about vendor-specific rules that make CSS3 complex. You will be introduced to the five most used libraries in the following sections. These libraries are as follows:
Less Elements (http://lesselements.com)
Less Hat (http://lesshat.madebysource.com/)
ClearLess (http://clearleft.github.com/clearless/)
Preboot (http://markdotto.com/bootstrap/)
A more comprehensive list of mixin libraries can also be found at http://lesscss.org/usage/#frameworks-using-less.
Please understand that you don't have to choose; there is no restriction that you have to use only one of these libraries. All these libraries have pros and cons; you have...