Now the basics are good.
You don't have redirects http -> https. But don't redirect /.well-known/acme-challenge to your special https host. And you don't have a preferred version (non-www or www).
Check all red things.
link
stylesheet
../../../css/main.css
404
2001 Bytes Not Found
1
missing file
missing file - there is no such file, so the link is wrong.
You can ignore the
Cross-Origin Resource Sharing (CORS) supported
missing crossorigin=anonymous|use-credentials and integrity - attribute, possible hash-values:
sha256-qNcUKMnme5sujEfmbJD0UwScRinMowDNm1DAzVNI2R4=
sha384-sLfbIJNbwTdFTjHNynT+8jI2OpM/W6wmzhYfLvsNbg1yuaW2rbGaeMpoe9QDITRJ
sha512-H7uz8NSEA/yUtVsUDP145QCyR4zal/+ev62KgXt6T+SjPojmJxKn4vCw3bhNynPDHEdNMVWHPqDABTdE8OhCQA==
<link rel="stylesheet" href="//fonts.googleapis.com/css?family=Roboto:300,400,500,700" crossorigin="anonymous" integrity="sha256-qNcUKMnme5sujEfmbJD0UwScRinMowDNm1DAzVNI2R4= " />
that's very new (added last weekend) and isn't (currently) used to calculate the range.