Get Styles inventory from a given SXA website

Get-SiteStyles.ps1

$siteroot = "master:\content\Sitecore\MVP"

gci "$($siteroot)\Presentation\Styles" -Recurse | 
    ? { $_.TemplateName -eq "Style" } | 
    select-object @{Name="EE Category / Horizon Controller Name"; Expression={$_.Parent.DisplayName}},
        @{Name="Horizon Controller Type"; Expression={$_.Parent.Fields["Type"]}}, 
        @{Name="Style Name"; Expression={$_.DisplayName}}, 
        @{Name="CSS Class"; Expression={$_.Value}}, 
        @{Name="Allowed on Components"; Expression={($_.PSFields."Allowed Renderings".Items | 
                                                     % { Get-Item master:\ -ID $_ } | 
                                                     % { $_.DisplayName }) -join ", " }} | 
    Show-ListView