Moving Background Issue

[Xorflo]

So basically I want the clouds in the image below to move. I'm sure I did my css correctly but here it is:

.clouds {
                background-image:url('/app/tpl/skins/habbo/static/clouds.png');
                width:100%;
                height:100%;
                position:absolute;
                overflow:hidden;
                -webkit-animation: slide 60s linear infinite;
                z-index:-2;
            }

And it still wont work! Any help?

 

[Weasel]

Moved to coding (as it hasn't anything to do with a "Retro").

Anyways, I am going to sound like a total noob, but use <marquee></marquee>?

 

[Xorflo]

Ill give it a shot actually (y)