Element block pseudo-element :before generated with width 160px transition box-sizing content-box margin 0px border 0px rgba(0,0,0,1) solid box-shadow 1px 1px 1px rgba(0,0,0,0.3) background text-shadow 1px 1px 1px rgba(0,0,0,0.2) display block cursor default z-index auto border-radius font-size 16px float none transform height auto position static overflow hidden padding 20px line-height 1 font-weight normal