删除文本框和按钮之间的空间

Question

我的代码如下：我想删除textboxes和按钮之间的空格，因此所有3个元素都相互粘连。我怎样才能完成这件事。

<div class="container">
    <div class="row">
        <div class="panel panel-default col-md-12  ">
            <div class="panel-body">
                <form action="#" role="form" class="form-inline">

                    <div class="form-group col-md-4 ">
                        <input type="email" class="form-control " placeholder="Email Address" required>

                    </div>
                    <div class=" form-group col-md-4 span7 ">
                        <input type="email" class="form-control " placeholder="Email Address" required>
                    </div>
                    <div class=" form-group col-md-4">
                        <button class="btn btn-primary btn-circle " type="submit">Sign up for free</button>
                    </div>


                </form>
            </div>
        </div>
    </div>
</div>

输出

Answer 1

尝试使用此代码，它会将所有元素粘在一起。

我刚刚删除了表单组类。

<div class="container">
    <div class="row">
        <div class="panel panel-default col-md-12  ">
            <div class="panel-body">
                <form action="#" role="form" class="form-inline">

                    <div class=" col-md-4 ">
                        <input type="email" class="form-control " placeholder="Email Address" required>

                    </div>
                    <div class=" col-md-4 span7 ">
                        <input type="email" class="form-control " placeholder="Email Address" required>
                    </div>
                    <div class="  col-md-4">
                        <button class="btn btn-primary btn-circle " type="submit">Sign up for free</button>
                    </div>


                </form>
            </div>
        </div>
    </div>
</div>