html The entire table is centered up, down, left, and right, and can only be left and right. I want to make a login interface without connecting to the database. Please help me if I am new, _html/css_WEB-ITnose

<table align="center" valign="middle" style="height:180px;margin-top:-90px;top:50%;position: absolute;left:50%;margin-left:-120px;width:240px;"><tr><td>姓名</td><td><input type="text" name="name"></td></tr><tr><td>性别</td><td><input type="text" name="sex"></td></tr><tr><td>年龄</td><td><input type="text" name="age"></td></tr><tr><td>密码</td><td><input type="password" name="password"></td></tr><tr><td>确认密码</td><td><input type="password" name="password1"></td></tr><tr><td colspan="2"><input type="submit" value="注册"></td></tr></table>