模态框案例

css样式

* {
    margin: 0;
    padding: 0;
}
header {
    background-color: rgb(66, 164, 209);
    padding: 0.5em 1em;
    display: flex;
}
header button {
    margin-left: auto;
    width: 5em;
}
.container {
    position: relative;
    display: none;
}
.bg {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(150, 151, 223, 0.5);
}
.login {
    width: 16em;
    padding: 1.5em;
    background-color: white;
    border: 1px solid #c3c4c7;
    position: fixed;
    top: 50%;
    left: 50%;
    margin-top: -10em;
    margin-left: -8em;
}
#user_login,
#user_pass {
    font-size: 1.5em;
    line-height: 1.33333333;
    width: 100%;
    margin: 10px 0 24px 0;
    border-radius: 3px;
}
.button {
    display: flex;
    justify-content: space-around;
    align-items: baseline;
}
.button button {
    width: 5em;
    font-size: 1em;
}

模态框html代码

        <header>
            <h3>XX博客后台</h3>
            <button onclick="document.querySelector('.container').style.display='block'">登录</button>
        </header>
        <div class="container">
            <div class="bg" onclick="this.parentNode.style.display='none'"></div>
            <div class="login">
                <form action="login.php" method="post">
                    <div class="user">
                        <p>
                            <label for="user_login">用户名/邮箱/手机号</label>
                        </p>
                        <input type="text" id="user_login" name="user_login" required autofocus />
                    </div>
                    <div class="pwd">
                        <p>
                            <label for="user_pass">密码</label>
                        </p>
                        <input type="password" id="user_pass" name="pwd" required />
                    </div>
                    <div class="button">
                        <p>
                            <input type="checkbox" name="rememberme" id="rememberme" value="rememberme" />
                            <label for="rememberme">记住我</label>
                        </p>
                        <button>登录</button>
                    </div>
                </form>
            </div>
        </div>

效果图

flex布局常用属性

grid布局常用属性

Correcting teacher：PHPz

Correction status：qualified

Teacher's comments：