你肯定应该像CSS中的样式选择、optgroup和选项那样做。在许多方面，背景色和颜色只是您通常需要的样式选项，而不是整个选择。

本机解决方案

下面是一个简单的HTML/CSS示例：https://jsfiddle.net/dkellner/e1jdspvb/

诀窍：由于某种原因，当你给select标记一个size属性时，它会突然理解CSS。通常，此属性用于创建始终可见的固定高度列表，但作为一个副作用，您现在可以对其进行样式设置。因此，我们所做的只是给它一个大小，然后实现显示/隐藏机制，以返回下拉列表的感觉。

简约版，不像示例那样时尚，但更容易理解：

<style>

    .stylish > span {position:relative;}
    .stylish select {position:absolute;left:0px;transform:scaleY(0);transform-origin:top center;}
    .stylish.dropped-down select {transform:scaleY(1);}

</style>
...
<div class="stylish">
    <label> Choose your superhero: </label>
    <span>
        <input   onclick  = "this.closest('div').classList.toggle('dropped-down');"><br>
        <select  onclick  = "this.closest('div').classList.remove('dropped-down');"
                 onchange = "this.closest('div').querySelector('input').value=this.value;"
                 size=9
        >
            <optgroup label="Fantasy"></optgroup>

            <option value="gandalf">  Gandalf       </option>
            <option value="harry">    Harry Potter  </option>
            <option value="jon">      Jon Snow      </option>

            ...                
            
        </select>
    </span>
</div>

附加说明

这实际上实现了一个可编辑的下拉列表；使用只读以避免编辑＜optgroup＞标记是空的（不是围绕选项标记），这样更具风格

我用Bootstrap找到了你的案子。这是最简单的解决方案：

选择表单控件{-moz外观：无；-webkit外观：无；外观：无；背景位置：右中心；背景重复：无重复；背景尺寸：1ex；背景原点：内容框；背景图像：url(“数据：image/svg+xml；base64，PD94bWwgdmVyc2lvbj0iMS4wIiBlbbNvZGluZz0iVVRGLTgiIHN0YW5kYWxvbmU9Im5vIj8+CjxzdmcKICAgeG1sbnM6ZGM9Imh0dHA6Ly9wdXJsLm9y9kYy9lbGVtZW50cy8xLjEvIgogICB4bWxuczpjYz0iaHR0cDovL2NyZWF0aXZlY29tbW9ucy5vcmcvbnMjIgogICB4Wxu czpyZGY9Imh0dHA6Ly93d3cudzMub3JnLzE5OTkvMDIvMjItcmRmLXN5bnRheC1UcyMiCiAgIHhtbG5zOnN2Zz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmicCiAgIHht bG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIKICAgdmVyc2lvbj0iMS4xIgogICBpZD0ic3ZnMiIKICAgdmlld0JveD0iMCAwIDM1Ljk3MDk4MyAyMy4wOTE1MTgiCiAgIGhlaWdodD0iNi41MTY5Mzk2bW0iCiAgIHdpZHRoPSIxMC4NTE4MTFtbSI+CiAgPGRlZnMKICAgICBpZD0ZGVmczQiIC8+CiAgPG1ldGFkYXRhCiAgICAgaWQ9Im1ldGFkYXRhNyI+CiAgICA8cmRmRmJERj4K ICAgICAgPGNjOldvcmsKICAgICAgICAgcmRmOmFib3V0PSIiPgogICAgIDxkYzpmb3JtYXQ+aW1hZ2Uvc3ZnK3htbDwvZGM6Zm9ybWF0GogICAgICgIDxKYzp0eXBlCiAgICAgICAgICAgcmRmOnJlc291cmNlPSJodHRwOi8vcHVybC5vcmcvZGMvZGNtaXR5cGUvU3RpbGxJbWFnZSIgLz4KICAgICAg ICAgICAc8ZGM6dGl0bGU+PC9kYzp0aXRsZT4KICAgPC9jYzpXb3JrGogICAgPC9 yZGY6UkRGPgogIDwvbWV0YWRhdGE+CiAgPGcKICAgICB0cmFuc2Zvcm09InRyYW5zbGF0ZSgtMjAyLj AxNDUxLC00MDcuMTIyMjUpIgogICAgIGlkPSJsYXllcjEiPgogICAgPHRleHQKICAgICAgIGLKPSJ0ZXh0MzMzNiIKICAgICAgIHk9IjYyOS41MDUwNyIKICAgIHg9IjI5MS40Mjg1NiIKICAgICagIHN0eWxlPSJmb250LXeWxlOm5vcm1hbDtmb250LXdlaWdodDpub3JtYWw7Zm9udC1zaXplOjQwcHg7bGluZS1oZlnaHQ6MTI1JTtmb250LWZhbWlseTpzYW5zLXNlcmlmO2xldHRlc1zcGFjaW5nOjBweDt3b3JkLXNwYWpbmc6MHB4O2ZpbGw6IzAwMDAwMDtmaWxsLW9wYWpdHk6MTtzdHJva2U6bm9uZTtzdHJVa2Utd2lkdGg6MXB4O30cm9rZS1saW5lY2FwOmJ1dHQ7c3Ryb2tlLWxpbmVqb2luOm1pdGVyO30cm9 rZS1vcGFjaXR5OjEiCiAgICAgICB4bWw6c3BhY2U9InByZXNlcnZlIj48dHNwYW4KICAgICAgT0iNjI5LjUwNTA3GogICAgICB4PSIyOTEuNDI4NTYiCiAgICAgIGlkPSJ0c3BhbjMzMzgiPjwvdHNwYW4+PC90ZXh0GogICAg PGcKICAgICAgIglkPSJ0ZXh0MzM0MCIKICAgICAgIHN0eWxlPSJmb250LXN0eWXLOm5vcm1hbDtmb250LXZhcmlhbnQ6bm9ybWFsO2ZvbnQtd2VpZ2h0Om5vcm2hbDtmb2 50LXN0cmV0Y2g6bm9yWFsO 2ZvbnQtc2l6ZTo0MHB4O2xpbmUtaGVpZ2h0OjEyNSU7Zm9udC1mYW1pbHk6Rm9udEF3ZXNvbWU7LWlua3NjYXBlLWZvbnqtc3blY2lmaWNhdGlvbjpGb250QXdlc29tZTtsZXR0ZXItc3BhY2luZzowcHg7d29yZC1zcGFjaW5nOjBweDtmaWxsOiMwMDAwMDA7Zmlsbc1vcGFjaXR5OjE7c3 Ryb2tlOm5vbmU7c3 Ryb2tl LXdpZHRojFweDtzdHJva2UtbGluZWNhcDpidXR0O3N0cm9rZS1saW5lam9pbjptaXRlcjtzdHJVa2Utb3BhY2l0eToxIj4KICAgICAgPHBhdGgKICAgICAgICAgaWQ9InBhdGgzMzQ1IggICAgICBzdHls ZT0iZmlsbDojMzMzMz MzO2ZpbGwtb3BhY2l0eToxIggICAgICBkPSJtIDizNy41NjY5Niw0MTMuMjU1MDcgYyAwLjU1ODA0LC0wLjU1OD A0IDAuNTU4MDQsLTEuNDczMjIgMCwtMi4wMzEynSBsIC0zLjcwNTM1LC0zLjY4MzA0IGMgLTauNTU4MDQsLTauNTU4MDQgLTEuNDuwOSwtMC41NTgwNCAtMi4wMDg5MywwIEwgMjIwLDQxOS4zOTM0NiAyMDguMTQ3MzIsNDA3LjU0MDc4IGMgLTAUNTU4MDDMsLTauntU4MDDQgLTeuNDuwodksLTauNTu4MDQgLTEuMDA4OTMsMCBsiC0zLjcw NTM1LDMuNjgzMDQgYyAtMC41NTgwNCwwLjU1ODD AzIC0wLjU1ODA0LDEuNDczMjEgMCwyLjAzMTI1IGwgMTYuNTYyNSwxNi41NDAxNyBjIDAuNTU4MMSC41NTWGNCAxLjQ1MDg5LDAuNTU4MDQgMi4wMDg5MiwwIGwgMTYUNTYyNSSwtMTYuNTQwMTcgeiIgLz4KICAgIDwZz4KICA8L2c+Cjwvc3ZnPgo=“）；}<link href=“https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css“rel=”stylesheet“/><section class=“container”><form class=“form horizontal”><select class=“表单控件”><option>一个</option><option>两个</option></选择></form></section>

注意：base64在SVG中是一个V字形。

自定义选择CSS样式

在Internet Explorer（10和11）、Edge、Firefox和Chrome中测试

select：：-ms扩展{显示：无；}选择{显示：内联块；框大小调整：边框框；衬垫：0.5em 2em 0.5em 0.5em；边框：1px实心#eee；字体：inherit；线条高度：inherit；-webkit外观：无；-moz外观：无；-ms外观：无；外观：无；背景重复：无重复；背景图像：线性梯度（45deg，透明50%，currentColor 50%），线性梯度（135deg，当前Color 50%，透明50%）；背景位置：右15px顶部1em，右10px顶部1nm；背景尺寸：5px 5px，5px 5px；}<select name=“”><option value=“”>Lorem</option><option value=“”>Lorem Ipsum</option></选择><select name=“”已禁用><option value=“”>禁用</option></选择><select name=“”style=“color:red；”><option value=“”>颜色</选项><option value=“”>Lorem Ipsum</option></选择>

您还可以向下拉列表中添加悬停样式。

选择｛position:relative；float:left；width:21.4%；height:34px；background:#f9f9e0；border:1px solid#41533f；padding:0px 10px 0px 10px；color:#41533f；margin:-10px 0px 0px 20px；backbackground:透明；字体大小：12px；-webkit外观：无；-moz外观：无(https://alt-fit.com/images/global/select-button.png)100%/15%无重复选择：悬停｛background:url(https://alt-fit.com/images/global/select-button.png)100%/15%无重复#fff；}<html><head></head><body><select name=“type”class=“select”><option style=“color:#41533f；”value=“select option”>选择选项</option><option value=“选项1”>选项1</option><option value=“option 2”>选项2</option><option value=“选项3”>选项3</option></选择></body></html>

这里有一个基于我在这次讨论中最喜欢的想法的解决方案。这允许直接设置＜select＞元素的样式，而无需任何附加标记。

它可以使用Internet Explorer 10（及更高版本），并为Internet Explorer 8/9提供安全回退。这些浏览器需要注意的一点是，背景图像必须定位并足够小，以便隐藏在本机扩展控件后面。

HTML

<select name='options'>
  <option value='option-1'>Option 1</option>
  <option value='option-2'>Option 2</option>
  <option value='option-3'>Option 3</option>
</select>

SCSS

body {
  padding: 4em 40%;
  text-align: center;
}

select {
  $bg-color: lightcyan;
  $text-color: black;
  appearance: none; // Using -prefix-free http://leaverou.github.io/prefixfree/
  background: {
    color: $bg-color;
    image: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/1255/caret--down-15.png");
    position: right;
    repeat: no-repeat;
  }
  border: {
    color: mix($bg-color, black, 80%);
    radius: .2em;
    style: solid;
    width: 1px;
    right-color: mix($bg-color, black, 60%);
    bottom-color: mix($bg-color, black, 60%);
  }
  color: $text-color;
  padding: .33em .5em;
  width: 100%;
}

// Removes default arrow for Internet Explorer 10 (and later)
// Internet Explorer 8/9 gets the default arrow which covers the caret
// image as long as the caret image is smaller than and positioned
// behind the default arrow
select::-ms-expand {
    display: none;
}

代码笔

http://codepen.io/ralgh/pen/gpgbGx