CSS를 사용하여 이미지 맵에서 마우스 오버 효과를 어떻게 얻을 수 있습니까?

<img src="{main_photo}" alt="locations map"  usemap="#location-map" />
<map name="location-map">
    <area shape="rect" coords="208,230,290,245" href="{site_url}locations/grand_bay_al" />
    <area shape="rect" coords="307,214,364,226" href="{site_url}locations/mobile_al" />
    <area shape="rect" coords="317,276,375,290" href="{site_url}locations/loxley_al" />
</map>

area { border: 1px solid #d5d5d5; }

<div class="area">

.area {
    background: #fff;
    display: block;
    height: 475px;
    opacity: 0;
    position: absolute;
    width: 320px;
}
#area2 {
    left: 320px;
}
#area1:hover, #area2:hover {
    opacity: 0.2;
}