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I know that, but i checked the style.css file of zenko and has some content now, so you just need to empty the caches. Be sure to empty both CloudFlare's cache and AlterVista's cache (the one under...

Be sure to empty your browser (and CloudFlare's) cache, it looks ok to me now.

Open the Permalink settings on the WordPress admin panel and save, without changing anything. You'll also need to reinstall the theme, since the stylesheet is now empty.

You can buy more space, but check first if everything is ok. There are some plugins (like backup plugins) that create many files and end up by fill the space available.
If you don't want to buy more...

You have no space available on your account, you should start by fixing that.