效果如下图

纯CSS实现小三角提示信息（1）
代码

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title></title>
    <style media="screen">
        .arrow_box {
            position: relative;
            border: 1px solid #c2e1f5;
            padding: 10px;
            width: 200px;
            height: 100px;
            border-radius: 6px;
            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
            margin: 50px;
            float: left;
        }

        .arrow_box:before,
        .arrow_box:after {
            position: absolute;
            display: block;
            width: 0;
            height: 0;
            border: solid transparent;
            pointer-events: none;
            content: "";
            border-color: rgba(136, 183, 213, 0);
        }

        .arrow_box.down:before {
            border-bottom-color: #c2e1f5;
            border-width: 12px;
            left: 49%;
            margin-left: -10px;
            bottom: 100%;
        }

        .arrow_box.down:after {
            border-bottom-color: #fff;
            border-width: 10px;
            left: 50%;
            margin-left: -10px;
            bottom: 100%;
        }

        .arrow_box.up:before {
            border-top-color: #c2e1f5;
            border-width: 12px;
            left: 49%;
            margin-left: -10px;
            top: 100%;
        }

        .arrow_box.up:after {
            border-top-color: #fff;
            border-width: 10px;
            left: 50%;
            margin-left: -10px;
            top: 100%;
        }

        .arrow_box.left:before {
            border-left-color: #c2e1f5;
            border-width: 13px;
            top: 38%;
            left: 100%;
        }

        .arrow_box.left:after {
            border-left-color: #fff;
            border-width: 10px;
            top: 41%;
            left: 100%;
        }

        .arrow_box.right:before {
            border-right-color: #c2e1f5;
            border-width: 13px;
            top: 38%;
            right: 100%;
        }

        .arrow_box.right:after {
            border-right-color: #fff;
            border-width: 10px;
            top: 41%;
            right: 100%;
        }
    </style>
</head>

<body>
    <div class="popovers-body">
        <div class="arrow_box down"></div>
        <div class="arrow_box up"></div>
        <div class="arrow_box left"></div>
        <div class="arrow_box right"></div>
    </div>
</body>

</html>
转载至https://www.cnblogs.com/yingzi1028/p/6215526.html和https://www.cnblogs.com/yeyinfu/p/7317149.html
纯CSS实现小三角提示信息（1）

效果如下图

代码

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