PageSpeed Insights suggests me to:

"Eliminate external render-blocking Javascript and CSS in above-the-fold content. Your page has 1 blocking CSS resources. This causes a delay in rendering your page. Optimize CSS delivery for the following resources: http://itransformer.es/css/c0f9425.css"

The css file c0f9425.css is the combined file with jquery-ui.css file and custom one.

I don't really understand this point. How should I follow this suggestion?

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