Bootstrap Jumbotron 错误页边距警报

Question

我正在创建我的网站的一部分，其中包括来自 Bootstrap 框架的 Jumbotron 和可折叠的警报消息。我对警告框的边距有疑问。我对 Jumbotron 使用标准 CSS 并调整了填充，但这不会影响我的问题。

这是未修改的样子：

我希望警告框与选择框对齐。我尝试用这个覆盖警报 class 的属性：

.alert-custom-style {
    margin-left: 15px;
    margin-right: 15px;
    width: 100%;
}

结果在这里：

这对左侧确实有效，但右侧边距属性不知何故没有被考虑。我通过将 margin-left 放回 0px 来测试它，但它看起来就像第一张图片。我真的很想知道为什么左边距属性有效，但右边距无效。非常感谢任何建议或帮助。

这里是 HTML-代码：

        <div class="jumbotron jumbotron-custom">
            <div class="row">
                <div class="col-lg-5 col-md-5 col-sm-12 col-xs-12 top-buffer">
                    <!-- Dropdown List for the first country -->
                    <select id="country1" name="Country Selection 1" class="selectpicker" data-width="100%" data-style="btn-default" data-live-search="true" title="Choose..."></select>
                </div>

                <div class="col-lg-2 col-md-2 col-sm-12 col-xs-12 top-buffer">
                    <!-- Compare Button -->
                    <button id="btnSubmit" type="Submit" class="btn btn-success btn-block">Compare</button>
                </div>

                <div class="col-lg-5 col-md-5 col-sm-12 col-xs-12 top-buffer">
                    <!-- Dropdown List for the second country -->
                    <select id="country2" name="Country Selection 2" class="selectpicker" data-width="100%" data-style="btn-default" data-live-search="true" title="Choose..."></select>
                </div>

                <!-- JavaScript file to handle the data management -->
                <script src="js/compare.js"></script>
                <!-- JavaScript file to handle the selection lists -->
                <script src="js/lists.js"></script>
            </div>

            <div class="row top-buffer">
                <div id="alert" class="collapse alert alert-custom-style col-lg-12 col-md-12 col-sm-12 col-xs-12" role="alert"> <!-- Collapsed by default -->
                    <strong>Warning: </strong><span id="alert-span">Please select at least two different countries</span>
                </div>
            </div>
        </div>

Answer 1

对于包含 class top-buffer 警报的行尝试添加：

margin-left: 15px;
margin-right: 15px;

我没有你所有的 css，但这里有一个粗略的版本，我认为它近似于你想要的。

使用代码段底部的 "full page" 按钮在更宽的视图中查看结果。

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />

<div class="container">
    <div class="jumbotron">
      <div class="col-lg-5 col-md-5 col-sm-12 col-xs-12 top-buffer">
        <!-- Dropdown List for the first country -->
        <select id="country1" name="Country Selection 1" class="selectpicker" style="width:100%;" data-width="100%" data-style="btn-default" data-live-search="true" title="Choose...">
        </select>
      </div>
      <div class="col-lg-2 col-md-2 col-sm-12 col-xs-12 top-buffer">
        <!-- Compare Button -->
        <button id="btnSubmit" type="Submit" class="btn btn-success btn-block" style="width:100%;">
          Compare
        </button>
      </div>
      <div class="col-lg-5 col-md-5 col-sm-12 col-xs-12 top-buffer">
        <!-- Dropdown List for the second country -->
        <select id="country2" name="Country Selection 2" class="selectpicker" style="width:100%;" data-width="100%" data-style="btn-default" data-live-search="true" title="Choose...">
        </select>
      </div>
      <div class="row top-buffer" style="margin-left: 15px; margin-right: 15px;">
      <div id="alert" class="collapse in alert alert-custom-style col-lg-12 col-md-12 col-sm-12 col-xs-12" role="alert" style="background-color: red;"> <!-- Collapsed by default -->
        <strong>Warning: </strong><span id="alert-span">Please select at least two different countries</span>
      </div>
    </div>
  </div>
</div>

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