.box-corner::after{content:"";position:absolute;right:0;bottom:0;width:100px;height:50px;border-right:5px solid red;border-bottom:5px solid red}.box-corner::before{content:"";position:absolute;left:0;top:0;width:100px;height:50px;border-left:5px solid red;border-top:5px solid red}.box-corner-right{.box-corner-right{position:relative}.box-corner-right::before,.box-corner-right::after,.box-corner-right::first-line,.box-corner-right::first-letter{content:'';position:absolute;background:red}.box-corner-right::before{width:50px;height:5px;top:0;left:0}.box-corner-right::after{width:5px;height:50px;top:0;left:0}}.box-corner-small::after{content:"";position:absolute;right:0;bottom:0;width:20px;height:20px;border-right:5px solid red;border-bottom:5px solid red}.box-corner-small::before{content:"";position:absolute;left:0;top:0;width:20px;height:20px;border-left:5px solid red;border-top:5px solid red}box-shadow:0 0.5rem 1rem rgba(0,0,0,0.15)!important;