filter:drop-shadow实现尖角带阴影的提示面板效果实例页面

CSS代码：

.box {
    margin: 40px; padding: 50px;
    background-color: #fff;
    position: relative;
    font-size: 24px;
}
.cor {
    position: absolute;
    left: -40px;
    widtd: 0; height: 0;
    overflow: hidden;
    border: 20px solid transparent;
    border-right-color: #fff;
}
.box-shadow {
    box-shadow: 5px 5px 10px black;
}
.drop-shadow {
    filter: drop-shadow(5px 5px 10px black);
}
                

HTML代码：

<div class="box box-shadow">
    <i class="cor"></i>
    box-shadow
</div>
<div class="box drop-shadow">
    <i class="cor"></i>
    filter: drop-shadow
</div>