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<li class="ChangeElem_Panel">
    <h4>江戸川区</h4>
</li>

.ChangeElem_Panel h4 {
	font-size: 2rem;
	font-weight: bold;
}

.ChangeElem_Panel h4:before {
	content: "";
	display: inline-block;
	width: 0;
	height: 0;
	border-left: 0.9rem solid transparent;
	border-right: 0.9rem solid transparent;
	border-top: 1.5rem solid black;
	margin-top: -10px;
}