1，模态框

<!DOCTYPE html>
<html lang="zh-CN">
<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>模态框</title>
    <link rel="stylesheet" href="modal.css" />
</head>
<body>
    <header>
        <h2 class="title">新浪微博</h2>
        <button onclick="showModal()">登录</button>
    </header>
    <!-- 模态框 -->
    <div class="modal">
        <!-- 1. 半透明的遮罩 -->
        <div class="modal-bg" onclick="closeModal()"></div>
        <!-- 2. 弹层表单 -->
        <form action="" class="modal-form">
            <fieldset style="display: grid; gap: 1em">
                <legend>用户登录</legend>
            <div>
                <label for="username">用户名：</label>
                <input type="text" id="username"  name="username" value=""  placeholder="1234567@qq.com"  autofocus required/>
            </div>
           <div>
            <label for="psw">密码：</label>
            <input type="password" id="psw" name="password" value=""  placeholder="字母+数字,不少于8位"  required/>
           </div>
                <button>登录</button>
            </fieldset>
        </form>
    </div>
    <script src="modal.js"></script>
</body>
</html>

/* 初始化 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
/* 头部 */
header {
    background-color: lightseagreen;
    padding: 0.5em 1em;
    display: flex;
}
/* logo  */
header .title {
    font-weight: lighter;
    font-style: italic;
    color: white;
    letter-spacing: 2px;
    /* text-shadow: 1px 1px 1px #555; */
}
/* 登录按钮 */ 
header button {
    margin-left: auto;
    width: 5em;
    border: none;
    border-radius: 0.5em;
} 
header button:hover {
    cursor: pointer;
    background-color: coral;
    color: #fff;
    box-shadow: 0 0 5px #fff;
    transition: 0.3s;
}
/* 模态框 */
.modal .modal-form fieldset {
    height: 22em;
    background-color: lightcyan;
    border: none;
    padding: 2em 3em;
    box-shadow: 0 0 5px #888;
}
/* 模态框表单标题 */
.modal .modal-form fieldset legend {
    padding: 7px 1.5em;
    background-color: lightseagreen;
    color: white;
}
.modal .modal-form fieldset input {
    height: 3em;
    padding-left: 1em;
    outline: none;
    border: 1px solid #ddd;
    font-size: 14px;
}
/* :focus: 表单控件,获取焦点时的样式 */
.modal .modal-form fieldset input:focus {
    box-shadow: 0 0 8px #888;
    border: none;
}
.modal .modal-form fieldset button {
    background-color: lightseagreen;
    color: white;
    border: none;
    height: 3em;
    font-size: 16px;
    height: 2.5em;
}
.modal .modal-form fieldset button:hover {
    background-color: coral;
    cursor: pointer;
}
/* 定位 */
.modal .modal-form {
    position: fixed;
    top: 10em;
    left: 38em;
    right: 38em;
}
/* 遮罩 */
.modal .modal-bg {
    position: fixed;
    /* 坐标全部清0,请定位到四个顶点 */
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgb(0, 0, 0, 0.5);
}
.modal {
    display: none;
}

模态框登录案列

1，模态框

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