模态框练习

模态框界面

html：

<!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>练习模态框</title>
    <link rel="stylesheet" href="作业1.css">
</head>
<body>
    <header>
        <h2>后台管理系统</h2>
        <button>登录</button>
    </header>
    <!-- 模态框 -->
    <div class="modal">
        <!-- 半透明的遮罩 -->
        <div class="modal-bg"></div>
            <!-- 弹窗表单 -->
            <form action="" class="my_form">
                <fieldset style="display: grid;gap: 1em;">
                    <legend>用户登录</legend>
                    <label for="user">账号:</label>
                    <input type="text" id="user" placeholder="请输入账号">
                    <label for="pwd">密码:</label>
                    <input type="password" id="pwd" placeholder="至少8位">
                    <button>登录</button>
                </fieldset>
            </form>
    </div>
</body>
</html>

css:

/* 初始化 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
/* 头部 */
header {
    background-color:chocolate;
    padding: 1.5em 1em;
    display: flex;
}
/* logo */
header > h2 {
    margin-left: auto ;
    margin-right: auto;
    color:azure;
}
/* 登录按钮 */
header > button {
    letter-spacing: 2px;
    border: none;
    border-radius: 0.5em;
    width: 5em;
}
header >button:hover {
    cursor: pointer;
    background-color:blueviolet;
    color: white;
    transition: 0.5s;
    box-shadow: 0 0 10px white;
}
/* 模态框 */
 .modal .my_form fieldset {
     height: 18em;
     border: none;
     padding: 3em 7em;
     background-color:gainsboro;
 }
 /* 模态框表单内容 */
 .modal .my_form fieldset input {
        height: 25px;
        outline: none;
        margin-left: 1em;
        border: 1px solid white;
 }
 /* 获取焦点后，阴影发光 */
 .modal .my_form fieldset input:focus {
     box-shadow:  0 0 10px black;
 }
    /* 表单登录按钮 */
 .modal .my_form fieldset button {
    cursor: pointer;
    font-size: 15px;
    letter-spacing: 3px;
    border-radius: 1.5em;
 }
 /* 登录键鼠标悬停 */
 .modal .my_form fieldset button:hover {
     background-color:blueviolet;
     color: white;
     outline: none;
     border-radius: 1.5em;
     transition: 0.5s;
     border: 1px solid ;
     box-shadow: 0 0 10px white;
}
/* 定位 */
 .modal .my_form {
     position: fixed;   
     top: 15em;
     left: 35em;
     right:40em;
 }
 /* 遮罩半透明 */
 .modal .modal-bg {
     position: fixed;
     top: 0;
     left: 0;
     right: 0;
     bottom: 0;
     background-color:rgb(0,0,0,0.5 );
 }

效果如下：

模态框界面

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