<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<link rel="shortcut icon"href="resources/img/logo-color.png"type="image/x-icon">
<title>测试</title>
<style>
.out-div {
    color: #FFFFFF;
    font-size: 16px;
    line-height: 40px;
    display: inline-block;
    height: 40px;
    width: 200px;
    text-align: center;
    border-radius: 5px;
    margin-left: 32px;
    vertical-align: top;
    background-color: maroon
}

.arrow {
    width: 0px;
    height: 0px;
    border-top: 10px solid transparent;
    border-right: 10px solid;
    border-bottom: 10px solid transparent;
    position: absolute;
    margin-left: -10px;
    margin-top: 10px;
    border-right-color: maroon
}

</style>
</head>
<body>
<div class="out-div">
<div class="arrow"></div>
<span>这是一个提示框</span>
</div>
</body>
</html>

 

 

 

 

 

 

参考地址 ： https://xianfei689.github.io/hg-demo/pc/toast/toast.html