simple.css is a lite and beautiful simple style, you don't need to remember the complex class name, you just need to remember five simple words -- apple, banana, cake, dog, egg
<button></button>
<button apple></button>
<button banana></button>
<button cake></button>
<button dog></button>
<button egg></button>
<input type="text" />
<input apple type="text" />
<input banana type="text" />
<input cake type="text" />
<input dog type="text" />
<input egg type="text" />
<input type="radio" />
<input apple type="radio" />
<input banana type="radio" />
<input cake type="radio" />
<input dog type="radio" />
<input egg type="radio" />
<input type="checkbox" />
<input apple type="checkbox" />
<input banana type="checkbox" />
<input cake type="checkbox" />
<input dog type="checkbox" />
<input egg type="checkbox" />