CSS/文章括弧

丸括弧

鉤括弧

CSS
#marukakko {
	position: relative;
	width: 200px;
	line-height: 100px;
	-webkit-box-sizing: border-box;
	box-sizing: border-box;
	margin: 50px auto;
	text-align: center;
}
#marukakko:before,
#marukakko:after {
	position: absolute;
	top: 0;
	content: '';
	width: 40px;
	height: 100%;
	border-radius: 50%;
	-webkit-box-sizing: border-box;
	box-sizing: border-box;
}
#marukakko:before {
	left: 0;
	border-left: 2px solid #555;
}
#marukakko:after {
	right: 0;
	border-right: 2px solid #555;
}

#kagikakko {
	position: relative;
	width: 200px;
	line-height: 100px;
	text-align: center;
	-webkit-box-sizing: border-box;
	box-sizing: border-box;
	margin: 50px auto;
}
#kagikakko:before,
#kagikakko:after {
	position: absolute;
	content: '';
	width: 20px;
	height: 40px;
	-webkit-box-sizing: border-box;
	box-sizing: border-box;
}
#kagikakko:before {
	top: 0;
	left: 00;
	border-top: 1px solid #555;
	border-left: 1px solid #555;
}
#kagikakko:after {
	bottom: 0;
	right: 0;
	border-bottom: 1px solid #555;
	border-right: 1px solid #555;
}