关于css div带有滚动条，使用定位导致滚动条失效

<div style="position: relative;left: 0;top: 0;">	<div class="museum-info" style="position: absolute;">		<div class="museum-name">			<h3></h3>		</div>		<div class="museum-introduce" style="height:300px;overflow-y: auto;">			<p></p>		</div>	</div></div><div style="position