吹き出しの方向に合わせてアイコンを反転させるCSS

fukidashi_icon-mirror.css

/*吹き出し用css------------------------------------*/
.entry-content .l-fuki,
.entry-content .r-fuki {
	position: relative;
	width: 80%;
	box-sizing: border-box;
	-webkit-box-sizing: border-box;
	padding: 10px;
	border-radius: 15px;
	border: 2px solid #ccc;
	background-color: #fff;
	z-index: 1;
}
.entry-content .l-fuki {
	margin: 20px 20% 40px 0;
}
.entry-content .r-fuki {
	margin: 20px 0 40px 19%;
}
.entry-content .l-fuki::before,
.entry-content .r-fuki::before {
	position: absolute;
	content: "";
	top: 16px;
	width: 10px;
	height: 10px;
	border-right: 2px solid #ccc;
	border-bottom: 2px solid #ccc;
	background-color: #fff;
	z-index: 2;
}
.entry-content .l-fuki::before {
	right: -7px;
	transform: rotate(-45deg);
	-webkit-transform: rotate(-45deg);
}
.entry-content .r-fuki::before {
	left: -7px;
	transform: rotate(135deg);
	-webkit-transform: rotate(135deg);
}
.entry-content .l-fuki::after,
.entry-content .r-fuki::after {
	position: absolute;
	content: "";
	width: 80px;
	height: 80px;
	top: -10px;
	border-radius: 50px;
	border: 3px solid #fff;
	background-size: cover;
	background-position: center center;
	background-repeat: no-repeat;
	box-shadow: 1px 1px 5px #aaa;
}
.entry-content .l-fuki::after {
	right: -110px;
	transform: scaleX(-1);//左に吹き出しがある場合左右反転させる
}
.entry-content .r-fuki::after {
	left: -110px;
}
@media screen and (max-width: 620px) {
	.entry-content .l-fuki,
	.entry-content .r-fuki {
		width: 70%;
		padding: 10px;
	}
	.entry-content .l-fuki {
		margin-right: 30%;
	}
	.entry-content .r-fuki {
		margin-left: 30%;
	}
}
@media screen and (max-width: 478px) {
	.entry-content .l-fuki::after,
	.entry-content .r-fuki::after {
		width: 60px;
		height: 60px;
		border-radius: 30px;
	}
	.entry-content .l-fuki::after {
		right: -84px;
	}
	.entry-content .r-fuki::after {
		left: -84px;
	}
}
/*アイコン画像*/
.hoge01::after {background-image:url(画像のURL);}
.hoge02::after {background-image:url(画像のURL);}
.fuga01::after {background-image:url(画像のURL);}
.fuga02::after {background-image:url(画像のURL);}

fukidashi_icon-mirror.html

<!-- htmlで吹き出しを呼び出す時の書き方 -->
<p class="r-fuki hoge01">右側に吹き出しがでます</p>
<p class="l-fuki fuga01">左側に吹き出しがでます</p>