Applying a color on HTML elements is not limited to one flat hue. CSS provides the ability to use color transitions, otherwise known as gradients, on elements. This is accessed through the <code>background</code> property's <code>linear-gradient()</code> function. Here is the general syntax:
<code>background: linear-gradient(gradient_direction, color 1, color 2, color 3, ...);</code>
The first argument specifies the direction from which color transition starts - it can be stated as a degree, where 90deg makes a vertical gradient and 45deg is angled like a backslash. The following arguments specify the order of colors used in the gradient.
Use a <code>linear-gradient()</code> for the <code>div</code> element's <code>background</code>, and set it from a direction of 35 degrees to change the color from <code>#CCFFFF</code> to <code>#FFCCCC</code>.