Cesium Note3:Cesium：添加按钮与原生按钮样式相同

惨

<div class="map3d-clear" title="清除全部点" onclick="celarPoint()"></div>

.map3d-clear {
    border-radius: 5px;
    height: 32px;
    width: 32px;
    position: absolute;
    left: 6px;
    bottom: 6px;
    background: #303336 url(../../Img/home/清空.png);
    border: 1px solid #303336;
    background-size: cover;
    z-index:6;
    cursor:pointer;
}
.map3d-clear:hover{
    color: #fff;
    fill: #fff;
    background: #48b url(../../Img/home/清空.png);
    background-size: cover;
    border-color: #aef;
    box-shadow: 0 0 8px #fff;
}