Time for action – adding a gradient and button images

Let's use what we learned about gradients and background images to make our application look more interesting. First, we'll add a gradient to the background of our task list application. We will add a linear gradient to the <div id="app"> element. It will start with our previous background color at the top and fade into a dark blue color at the bottom. Notice how we keep the old background color as a fallback for browsers that don't support gradients:

#app
{
    margin: 4px;
    background-color: #bbc;
    background: -webkit-linear-gradient(top, #bbc, #558);
    background: -moz-linear-gradient(top, #bbc, #558);
    background: -ms-linear-gradient(top, #bbc, #558);
    background: linear-gradient(top, #bbc, #558);
}

This is how it would look:

Now let's use CSS sprites to add images to the buttons in our task list application. We need images for delete, move up, and move down. Our buttons will be 16x16 pixels, so our images will need...