我在HTML表单中居中元素方面遇到了一些问题。这里有一个非常简单的例子:
https://jsfiddle.net/a9cnuypz/
#rectLogin {
margin: auto;
width: 60%;
border-style: solid;
border-width: 1px;
}
#formLogin {
margin: auto;
width: 60%;
display: inline-block;
}
#btn {
margin: auto;
display: inline-block;
width: 200px;
}
<div id="rectLogin">
<form id="formLogin">
<div>
<label>Username</label>
<fieldset>
<input type="text" name="username" required>
</fieldset>
<label>Password</label>
<fieldset>
<input type="password" name="password" required>
</fieldset>
<input id="btn" type="submit" value="Login">
</div>
</form>
</div>
![actual](https://istack.dev59.com/ZakIM.webp)
![desired](https://istack.dev59.com/Xe3HD.webp)