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