我认为答案是否定的，但是你可以用CSS定位一个背景图像，这样它就离右边有一个固定数量的像素?
如果我设置x和y的背景位置值，似乎它们只分别从左边和上面给出固定的像素调整。
当前回答
如果你只想指定x轴，你可以这样做:
background-position-x: right 100px;
其他回答
这在Chrome 27中工作，我不知道它是否有效，也不知道其他浏览器能做什么。我对此感到很惊讶。
background: url(../img/icon_file_upload.png) top+3px right+10px no-repeat;
只需将像素填充到图像中-在photohop中添加10px或任何图像的画布大小，并在CSS中对齐它。
求负值的解。调整右填充来移动图像。
<div style='overflow:hidden;'>
<div style='width:100% background:url(images.jpg) top right; padding-right:50px;'>
</div>
</div>
最合适的答案是background-position的新四值语法，但在所有浏览器都支持它之前，最好的方法是按照以下顺序组合之前的响应:
background: url(image.png) no-repeat 97% center; /* default, Android, Sf < 6 */
background-position: -webkit-calc(100% - 10px) center; /* Sf 6 */
background-position: right 10px center; /* Cr 25+, FF 13+, IE 9+, Op 10.5+ */
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.
