为了向上滑动背景颜色，您需要使用背景图片或某种渐变，同时逐渐调整 background-position ：

  .box {
 width：200px; height：100px; 
 background-size：100％200％; 
 background-image：linear-gradient（to bottom，red 50％，black 50％）; 
 transition：background-position 1s; 
} 

 .box：hover {
 background-position：0 -100％; 
} 
 

您可以在这里看到这个演示：http://jsfiddle.net/as5ZU/

I am trying to change the background colour of a element on hover by using CSS transitions. I want to do this by having it scroll up from the bottom. I can fade the background in using this, but I would like it to slide up:

-webkit-transition: background-color 0.5s linear;
-moz-transition: background-color 0.5s linear;
-o-transition: background-color 0.5s linear;  
transition: background-color 0.5s linear;

Sorry I'm not very good at CSS.

One other thought, would it be better to scroll up a separate element with the background applied to it.

Thanks for any help

In order to slide the background color up you would need to use a background image, or a gradient of some sort, while gradually adjusting the background-position:

.box {
    width: 200px; height: 100px;
    background-size: 100% 200%;
    background-image: linear-gradient(to bottom, red 50%, black 50%);
    transition: background-position 1s;
}

.box:hover {
    background-position: 0 -100%;
}

You can see this demo here: http://jsfiddle.net/as5ZU/