Flex布局来设计会员登录页

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>会员登录</title>
    <style>
        *{
    margin:0;
    padding:0;
    /*outline: 1px dashed #cccccc;*/
}
body{
    display: flex;
    height: 100vh;
    flex-flow: column nowrap;
    /*居中显示*/
    justify-content: center;
    align-items: center;
    font-weight: lighter;
    background: linear-gradient(to top, lightgreen, white, lightgreen);
}
.container{
    position:relative;
    margin-top: -80px;
    padding:20px;
    width:280px;
}
.container >h1{
    font-weight: lighter;
    text-align: center;
    font-size: 1.5rem;
    padding: 20px ;
}
.container>form{
    display: flex;
    flex-flow: column nowrap;
    border: 1px solid #ccc ;
    border-radius:12px;
    padding: 20px;
    background: linear-gradient(to top, lightcyan, white, lightcyan);
}
.container>form>div{
    padding: 10px;
}
.container>form:hover{
    background: linear-gradient(to right, white, lightcyan);
    box-shadow: 0 0 5px #2d6a88;
}
.container>form>div{
    display: flex;
}
.container>form>div>input{
    flex:1;
    border:1px #999999;
    border-radius: 5px;
    padding-left:5px;
}
.container>form>div>button{
    flex:1;
    border:1px;
    border-radius: 5px;
    background-color: #1c82d4;
    letter-spacing: 10px;
    color: #fff;
    padding: 3px;
    box-shadow:  0 2px 1px darkolivegreen;
}
.container>form>div>button:hover{
    box-shadow: 0 0 3px #2d6a88;
    background-color: #1c82d4;
}
    </style>
</head>
<body>
<div class="container">
<h1>会员登录</h1>
    <form action="index.html">
    <div>
        <label for="useremail">邮箱：</label>
        <input type="text" name="useremail" id="useremail" placeholder="请输入邮箱" required />
    </div>
    <div>
        <label for="password">密码：</label>
        <input type="password" name="password" id="password" placeholder="请输入密码" required minlength="6" maxlength="18" />
    </div>
        <div>
    <button>登录</button>
        </div>
    </form>
</div>
</body>
</html>
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