小编Pur*_*jay的帖子

我制作了一个注册脚本,允许用户注册我的网站.现在我遇到的问题是,注册界面所在的角度材料卡不在中心位置.我尝试了很多东西,包括<center>和[layout-align ="center center"],仍然无效我的代码:

<md-content class="md-padding" layout-xs="column" layout="row">
    <div flex-xs flex-gt-xs="40" layout="column" layout-align="center center">
        <md-card class="card-40-center">
            <md-card-title>
                <md-card-title-text>
                    <span class="md-headline">Sign Up</span>
                </md-card-title-text>
            </md-card-title>
            <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post" class="signup_form">
            <div class="md-padding" layout-align="center">
                <div layout="row">
            <md-input-container flex="100">
                <label>First name</label>
                <input>
            </md-input-container>
                <md-input-container flex="100">
                    <label>Last name</label>
                    <input>
                </md-input-container>
                    </div>
                <div layout="row">
                <md-input-container flex="100">
                    <label>Username</label>
                    <input>
                </md-input-container>
                <md-input-container flex="100">
                    <label>Email</label>
                    <input type="email">
                </md-input-container>
                    </div>
                <div layout="row">
                <md-input-container flex="100">
                    <label>Password</label>
                    <input type="password">
                </md-input-container>
                <md-input-container flex="100">
                    <label>Repeat Password</label>
                    <input type="password">
                </md-input-container>
                    </div>
                <div …