Putting a background on the 'alertbox'. Options

[dilligrout]

I'm wanting to make my '.alertbox' look like this:



I have the image:




I couldn't get it to work perfectly it kept being messed up. Help?

CODE

.alertbox{
padding:20px;
border:0px;
background-color:transparent;
background-image:url("");
background-repeat:no-repeat;
background-position:center;}