.logo_wapper{background:red;-webkit-clip-path:polygon(0 0,100% 0,100% 0,100% 100%,100% 100%,0 100%,0 100%,0 20%);clip-path:polygon(20% 0,100% 0,100% 0,100% 100%,100% 100%,0 100%,0 100%,0 20%);display:block;z-index:1}