Cascading Style Sheets（CSS）を使用してアイコンを実装します。

ご自由にご利用ください。

Previews

Examples html

<!-- icons -->

<div class="icons">

	<button class="item" type="button" aria-label="volume"><span></span></button>

</div>

<!-- /icons -->

Examples css

/* - icons - */

.icons {
	position: relative;
	width: 25px;
	height: 25px;
	margin: 0px 0px 0px 0px;
	padding: 0px 0px 0px 0px;
	background-color: rgba(0, 0, 0, 0.0);
	cursor: pointer;
}

.icons button.item {
	display: block;
	position: absolute;
	top: 8px;
	left: 0px;
	width: 12px;
	height: 9px;
	margin: 0px 0px 0px 0px;
	padding: 0px 0px 0px 0px;
	background-color: rgba(0, 0, 0, 1.0);
	-webkit-border-radius: 1.5px 0px 0px 1.5px;
	border-radius: 1.5px 0px 0px 1.5px;
	transition: all .5s;
}

.icons button.item::before {
	content: "";
	display: block;
	position: absolute;
	top: -4.5px;
	left: 0px;
	width: 0px;
	height: 0px;
	margin: 0px 0px 0px 0px;
	padding: 0px 0px 0px 0px;
	background-color: rgba(0, 0, 0, 0.0);
	border-top: 9px solid rgba(0, 0, 0, 0.0);
	border-right: 12px solid rgba(0, 0, 0, 1.0);
	border-bottom: 9px solid rgba(0, 0, 0, 0.0);
	transition: all .5s;
}

.icons button.item span {
	display: block;
	position: absolute;
	top: 0px;
	left: 8px;
	width: 9px;
	height: 9px;
	margin: 0px 0px 0px 0px;
	padding: 0px 0px 0px 0px;
	background-color: rgba(0, 0, 0, 0.0);
	border-top: 2px solid rgba(0, 0, 0, 0.0);
	border-right: 2px solid rgba(0, 0, 0, 1.0);
	border-bottom: 2px solid rgba(0, 0, 0, 0.0);
	border-left: 2px solid rgba(0, 0, 0, 0.0);
	-webkit-border-radius: 50%;
	border-radius: 50%;
	transition: all .5s;
}

.icons button.item span::before {
	content: "";
	display: block;
	position: absolute;
	top: -6px;
	left: -6px;
	width: 17px;
	height: 17px;
	margin: 0px 0px 0px 0px;
	padding: 0px 0px 0px 0px;
	background-color: rgba(0, 0, 0, 0.0);
	border-top: 2px solid rgba(0, 0, 0, 0.0);
	border-right: 2px solid rgba(0, 0, 0, 1.0);
	border-bottom: 2px solid rgba(0, 0, 0, 0.0);
	border-left: 2px solid rgba(0, 0, 0, 0.0);
	-webkit-border-radius: 50%;
	border-radius: 50%;
	transition: all .5s;
}

.icons button.item span::after {
	content: "";
	display: block;
	position: absolute;
	top: -10px;
	left: -10px;
	width: 25px;
	height: 25px;
	margin: 0px 0px 0px 0px;
	padding: 0px 0px 0px 0px;
	background-color: rgba(0, 0, 0, 0.0);
	border-top: 2px solid rgba(0, 0, 0, 0.0);
	border-right: 2px solid rgba(0, 0, 0, 1.0);
	border-bottom: 2px solid rgba(0, 0, 0, 0.0);
	border-left: 2px solid rgba(0, 0, 0, 0.0);
	-webkit-border-radius: 50%;
	border-radius: 50%;
	transition: all .5s;
}

.icons:hover button.item {
	background-color: rgba(192, 192, 192, 1.0);
}

.icons:hover button.item::before {
	border-right: 12px solid rgba(192, 192, 192, 1.0);
}

.icons:hover button.item span,
.icons:hover button.item span::before,
.icons:hover button.item span::after {
	border-right: 2px solid rgba(192, 192, 192, 1.0);
}

.icons:active button.item {
	background-color: rgba(0, 0, 0, 1.0);
}

.icons:active button.item::before {
	border-right: 12px solid rgba(0, 0, 0, 1.0);
}

.icons:active button.item span,
.icons:active button.item span::before,
.icons:active button.item span::after {
	border-right: 2px solid rgba(0, 0, 0, 1.0);
}

/* - /icons - */