<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Dave Blog</title>
    <link rel="stylesheet" href="hw.css">
</head>
<body>
    <!-- 简易的后台管理页面头部 -->
    <header>
        <div class="left">
            <span>Dave's Blog</span>
        </div>
        <div class="right">
            <span>Dave</span>
            <button onclick="showshadow()">登录</button>
        </div>
    </header>
    <!-- 模态框主体 -->
    <main>
        <div class="login">
            <!-- 遮罩 -->
            <div class="shadow" onclick="closeshadow()"></div>
            <!-- 登录页面 -->
            <form action="" class="modal-form">
                <fieldset style="display: grid; gap: 1em">
                    <legend>用户登录</legend>
                    <input type="email" name="email" placeholder="user@email.com" />
                    <input type="password" name="password" placeholder="不少于6位" />
                    <button>登录</button>
                </fieldset>
            </form>
        </div>
    </main>
</body>
<!-- 模态框显示关闭js -->
<script>
    function showshadow(){
        let login = document.querySelector(".login");
        login.style.display = 'block';
    }
    function closeshadow(){
        let login = document.querySelector(".login");
        login.style.display = 'none';
    }
</script>
</html>

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
/* 修改根元素 */
html{
    font-size: 20px;
}
header{
    width: 1fr;
    height: 3rem;
    background-color: deepskyblue;
    position: relative;
}
.left{
    /* 设置左边logo位置 */
    left: 0;
    margin-left: 3rem;
    margin-top: 0.5rem;
    position: absolute;
    /* 扩大logo */
    font-size: 1.5rem;
    font-weight: bold;
    color: rgb(179, 105, 179);
}
.right{
    /* 确定右边控件定位 */
    right: 0;
    margin-right: 4rem;
    margin-top: 0.75rem;
    position: absolute;
}
.right span{
    /* 细节右边控件 */
    margin-right: 1rem;
    color: rgb(179, 105, 179);
}
.right button{
    /* 初始化button样式 */
    border:none;
    outline: none;
    width: 2rem;
    height: 1.5rem;
    border-radius: 0.5em;
    background-color: rgb(0,0,0,0.5);
    color: white;
}
.right button:hover{
    /* 为button增加选中样式 */
    cursor: pointer;
    background-color: orange;
    transition: background-color 0.75s;
}
/* 初始化遮罩 */
.login .shadow{
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background-color: rgb(0,0,0,0.5);
}
/* 初始化登陆框样式 */
.login form fieldset{
    position: fixed;
    width: 15rem;
    /* height: 11em; */
    margin-left: 40vw;
    margin-top: 40vh;
    background-color: deepskyblue;
}
/* 初始化登陆框样式细节 */
.login form fieldset{
    border: none;
    border-radius: 0.5em;
}
/* 初始化legend样式属性 */
.login form fieldset legend{
    background-color: rgb(6, 81, 179);
    color: white;
    margin-left: 1rem;
    padding: 1rem;
    font-size: 30px;
    border: none;
    border-radius: 0.5em;
    margin-bottom: 1rem;
}
/* 初始化input */
.login form fieldset input{
    height: 1.5rem;
    width: 13rem;
    margin-left: 1rem;
    border: none;
    border-radius: 0.5em;
}
/* 设置input聚焦样式 */
.login form fieldset input:focus{
    box-shadow: 0 0 8px #888;
    border: none;
}
/* 设置登陆框登录按钮样式 */
.login form fieldset button{
    height: 1.25rem;
    width: 7.5rem;
    border: none;
    border-radius: 0.5em;
    background-color: rgb(0,0,0,0.5);
    color: white;
    margin-left: 3.5rem;
    margin-bottom: 1rem;
}
/* 为登录按钮添加样式 */
.login form fieldset button:hover{
    cursor: pointer;
    background-color: orange;
    transition: background-color 0.75s;
}
/* 默认隐藏登陆框 */
.login{
    display: none;
}

效果

display1
display2

模态框案例

效果

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