html - 如何增加选择框箭头的宽度？

Question

我想增加选择框箭头的宽度，如 fa fa 插入符号。我不知道该怎么做。我在每个字段中使用了 img 标签，并给定了绝对位置并使用左上角属性进行了调整，但我认为这不是正确的做法，即使我点击图像箭头也没有选择打开的选项，所以我删除了它。请告诉我正确的解决方案。

.search-categories{
    background: #E40444 !important;
    color: #fff !important;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0-beta1/jquery.js"></script>
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-alpha/js/bootstrap.min.js"></script>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.1/css/font-awesome.min.css">
    <style type="text/css">
    
    </style>

    <div class="col-md-12 ">
      <div class="row">
       <form action="#" method="get" id="search_mini_form">
          <div class="col-sm-offset-2 col-sm-2 catnames">
             <select name="cat" class="form-control search-categories">
                <option>Categories</option>
                <option value="3">abcd</option>
                <option value="4">abcd</option>
                <option value="5">abcd</option>
             </select>
          </div>
          <div class="col-sm-2 catnames catnames-arrow ">
             <select name="cat" class="form-control search-categories search-Hourly">
                <option>Hourly</option>
                <option value="3">abcd</option>
                <option value="4">abcd</option>
                <option value="5">abcd</option>
             </select>
          </div>
          <div class="col-sm-4 catquery ">
       <div class="input-group">
             <input type="search" class="form-control " name="q" id="location" value="" maxlength="128" placeholder="Search Place..." autocomplete="off" />
         <div class="input-group-addon catsubmit"><i class="fa fa-search"></i></div>
            </div>
          </div>
          <div id="search_autocomplete" class="search-autocomplete"></div>
       </form>
       </div>
    </div>

Answer 1

您可以使用 css 三 Angular 形来制作箭头。

HTML

<div class="selectwrap">
      <select>
        <option>Option 1</option>
        <option>Option 3</option>
        <option>Option 4</option>
      </select>
</div>

CSS

select {
  border: 1px solid #ccc;
  height: 34px;
  width: 250px;
  padding: 6px 12px;
  line-height: 1.42857143;
}

.selectwrap {
  position: relative;
  float: left;
}

.selectwrap:after {
  content: "";
  position: absolute;
  width: 0; 
  height: 0; 
  border-left: 8px solid transparent;
  border-right: 8px solid transparent;  
  border-top: 8px solid #000;
  right: 4px;
  top: 14px;
  pointer-events: none;
}