Customize colorbox caption (long caption and position of it)

Please see this link for example.

How can add a long caption under popup? For example, adding 3 lines like this:

we can add one line to title of tag and I tried to change this style

#cboxTitle {
position: absolute;
bottom: -25px;
left: 0px;
text-align: center;
width: 100%;
font-weight: bold;
color: #7C7C7C;

} by adding height or top:800px, caption deisapear