<body>
<div class="pop">气泡框</div>
</body>
body{display: flex;justify-content: center;align-items: center;height: 100%
}
.pop{display: flex;justify-content: center;align-items: center;background: #409eff;width: 150px;height: 70px;position: relative;border-radius: 5px;color: #fff;/** box-shadow: 0 0 10px #000; 换成filter*/filter: drop-shadow(0 0 10px #000) /** filter表示滤镜 drop-shadow表示阴影滤镜 */
}
.pop::before{content: '';background: #409eff;position: absolute;width: 20px;height: 20px;transform: rotate(45deg);left: -10px;top: 50%;margin-top: -10px;
}