有人可以告诉我如何将用户名标签对齐到左边.
<form class="form-horizontal">
<div class="form-group">
<label class="control-label col-sm-3" for="username">Username</label>
<div class="col-sm-9">
<input type="text" class="form-control" id="username" placeholder="Enter username">
</div>
</div>
</form>
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