吹き出しを簡単に作ってくれるジェネレーターのご紹介です。CssArrowPleaseは色やサイズ、吹き出しの位置など指定すれば簡単に作れて便利なのでおすすめです。

CssArrowPlease

吹き出しサンプル例

padding、margin、角丸などは修正しました。

左吹き出し

.arrow_box_left {
	position: relative;
	background: #fff;
	border: 4px solid #333;
	padding:2em 1.5em;
	border-radius:5px;
	margin:2em;
}
.arrow_box_left:after, .arrow_box_left:before {
	right: 100%;
	top: 50%;
	border: solid transparent;
	content: " ";
	height: 0;
	width: 0;
	position: absolute;
	pointer-events: none;
}

.arrow_box_left:after {
	border-color: rgba(255, 255, 255, 0);
	border-right-color: #fff;
	border-width: 10px;
	margin-top: -10px;
}
.arrow_box_left:before {
	border-color: rgba(51, 51, 51, 0);
	border-right-color: #333;
	border-width: 16px;
	margin-top: -16px;
}

右吹き出し

.arrow_box_right {
	position: relative;
	background: #fff;
	border: 4px solid #333;
	padding:2em 1.5em;
	border-radius:5px;
	margin:2em;
}
.arrow_box_right:after, .arrow_box_right:before {
	left: 100%;
	top: 50%;
	border: solid transparent;
	content: " ";
	height: 0;
	width: 0;
	position: absolute;
	pointer-events: none;
}
.arrow_box_right:after {
	border-color: rgba(255, 255, 255, 0);
	border-left-color: #fff;
	border-width: 10px;
	margin-top: -10px;
}
.arrow_box_right:before {
	border-color: rgba(51, 51, 51, 0);
	border-left-color: #333;
	border-width: 16px;
	margin-top: -16px;
}

上吹き出し

.arrow_box_top {
	position: relative;
	background: #fff;
	border: 4px solid #333;
	padding:2em 1.5em;
	border-radius:5px;
	margin:2em;
}
.arrow_box_top:after, .arrow_box_top:before {
	bottom: 100%;
	left: 50%;
	border: solid transparent;
	content: " ";
	height: 0;
	width: 0;
	position: absolute;
	pointer-events: none;
}

.arrow_box_top:after {
	border-color: rgba(255, 255, 255, 0);
	border-bottom-color: #fff;
	border-width: 10px;
	margin-left: -10px;
}
.arrow_box_top:before {
	border-color: rgba(51, 51, 51, 0);
	border-bottom-color: #333;
	border-width: 16px;
	margin-left: -16px;
}

下吹き出し

.arrow_box_bottom {
	position: relative;
	background: #fff;
	border: 4px solid #333;
	padding:2em 1.5em;
	border-radius:5px;
	margin:2em;
}
.arrow_box_bottom:after, .arrow_box_bottom:before {
	top: 100%;
	left: 50%;
	border: solid transparent;
	content: " ";
	height: 0;
	width: 0;
	position: absolute;
	pointer-events: none;
}

.arrow_box_bottom:after {
	border-color: rgba(255, 255, 255, 0);
	border-top-color: #fff;
	border-width: 10px;
	margin-left: -10px;
}
.arrow_box_bottom:before {
	border-color: rgba(51, 51, 51, 0);
	border-top-color: #333;
	border-width: 16px;
	margin-left: -16px;
}