はてなブックマーク

.corner_box01 { background: rgba(247, 17, 55, 0.8); width: 200px; height: 230px; position: relative; } .corner_box01:before { height: 0; display: block; position: absolute; right: -3px; content: ""; border-top: solid 50px #fff; border-left: solid 50px transparent; top: -3px; z-index: 2; } .corner_box01:after { height: 0; display: block; position: absolute; right: -2px; content: ""; border-top: sol