background-position: right 30px center;

它适用于大多数浏览器。完整列表见:http://caniuse.com/#feat=css-background-offsets。

更多信息:http://www.w3.org/TR/css3-background/#the-background-position

据我所知，CSS规范并没有提供您所要求的内容，当然，除了CSS表达式之外。除去你不想使用表达式或Javascript的假设，我看到了三个hack的解决方案:

Make sure your background image matches the size of the container (at least in width) and set background-repeat: repeat or repeat-x if only the width is equalized. Then, having something appear x pixels from the right is as simple as background-position: -5px 0px. Using percentages for background-position exhibits special behaviour that is better seen than described here. Give it a shot. Essentially, background-position: 90% 50% will make the right edge of the background image line up 10% away from the right edge of the container. Create a div containing the image. Explicitly set the position of the containing element position: relative if not already set. Set the image container to position: absolute; right: 10px; top: 10px;, obviously adjusting the final two as you see fit. Place the image div container into the containing element.

试试这个:

#myelement {
  background-position: 100% 50%;
  margin-right: 5px;
}

注意上面的代码会将整个元素(不仅仅是背景图像)向右移动5px。这对你的案子来说可能没问题。

另一个我没有看到提到的解决方案是使用伪元素，我相信这个解决方案将适用于任何CSS 2.1兼容的浏览器(≥IE8，≥Safari 2，…)，它也应该是响应:

element::after
{
content:' ';
position:relative;
display:block;
width:100%;
height:100%;
bottom:0;
right:-5px; /* 10 px from the right of element inner-margin (padding) see example */
background:url() right center no-repeat;
}

Example: The element eg. a square sized 100px (without considering borders) has a 10px padding and a background image should be shown inside the right padding. This means the pseudo-element is a 80px sized square. We want to stick it to the right border of the element with right:-10px;. If we'd like to have the background-image 5px away from the right border we need to stick the pseudo-element 5px away from the right border of the element with right:-5px;... Test it for your self here : http://jsfiddle.net/yHucT/

适用于所有真正的浏览器(以及IE9+):

background-position: right 10px top 10px;

我用它来RTL WordPress主题。 看例子:临时网站或真正的网站将很快上线。 看看大DIVs右下角的图标。

图像工作与透明像素在右边作为右边缘。

图像的变通方法是创建一个PNG或GIF图像(支持透明度的图像文件格式)，在图像的右侧有一个透明的部分，恰好等于你想要给予右边距的像素数(例如:5px, 10px等)。

这在固定宽度和百分比宽度上都能很好地工作。 实际上，这是一个很好的解决方案，手风琴头有一个加/减或向上/向下箭头图像在头的右边!

缺点:不幸的是，你不能使用JPG，除非容器的背景部分和CSS背景图像的背景颜色是相同的平面颜色(没有渐变/小插图)，主要是白色/黑色等。