How to use Noto Sans for posts but Sans UI for everything else?

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Hm..on one instance I currently use Noto Sans globally:

HEAD:

<link href="https://fonts.googleapis.com/css?family=Noto+Sans:400,500,700" rel="stylesheet">

CSS:

html {
    font-family: "Noto Sans", sans-serif;
}
body input, body button, body select, body textarea {
    font-family: "Noto Sans", Helvetica, Arial, sans-serif;
}

But since my HTML skills are from the 90’s, I am a bit unsure where to go from here. Has anyone patched anything similar and could share an example?