How can I fix these 2 errors?
Your page has 2 blocking CSS resources. This causes a delay in rendering your page.
None of the above-the-fold content on your page could be rendered without waiting for the following resources to load. Try to defer or asynchronously load blocking resources, or inline the critical portions of those resources directly in the HTML.
Optimize CSS Delivery of the following:
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<div class="navigation" style="color:red"></div>
$( "head" ).append("<link rel="stylesheet" type="text/css" href="theme.css">");
<noscript><link rel="stylesheet" type="text/css" href="theme.css"></noscript>
Like I said earlier.. don't bother unless you have a super simple site and this would be easy thing to do. It has literally almost no benefit for your page and is a huge time/effort investment.