Colour duplicate values in html output

Question

Hello,
I am looking to colour duplicate values in an html output file. 
I have written a folder comparison ps script which shows output as below:
Name Length Version
Name length and version are the column names
Now there are many duplicate entries under name column which I need to highlight using any one colour. I have sorted the output under name using alphabetical order.
I just need to highlight all duplicate values using a particular colour. 
Thanks in advance.

Answer 1

Posting my script here:
# Get Start Time
$startDTM = (Get-Date)
$a = "<style>"
$a = $a + "BODY{background-color:peachpuff;}"
$a = $a + "TABLE{border-width: 1px;border-style: solid;border-color: black;border-collapse: collapse;}"
$a = $a + "TH{border-width: 1px;padding: 0px;border-style: solid;border-color: black;background-color:thistle}"
$a = $a + "TD{border-width: 1px;padding: 0px;border-style: solid;border-color: black;background-color:PaleGoldenrod}"
$a = $a + "</style>"
$folderReference = Read-Host "Enter Reference Folder Name"
$folderDifference = Read-Host "Enter Difference Folder Name"
$FolderReferenceContents = Get-ChildItem $folderReference -Recurse | 
    where-object {-not $_.PSIsContainer}
$FolderDifferenceContents = Get-ChildItem $folderDifference -Recurse | 
    where-object {-not $_.PSIsContainer}
#get only files that are on reference folder not base folder
$one = Compare-Object -ReferenceObject $FolderReferenceContents `
-DifferenceObject $FolderDifferenceContents -Property ('Name', 'Length','Get-FileVersionInfo') -PassThru |
    where-object { $_.SideIndicator -eq '<='} | select Name, Length, LastWriteTime, VersionInfo
#get only files that are on base folder not on reference
$two = Compare-Object -ReferenceObject $FolderReferenceContents `
-DifferenceObject $FolderDifferenceContents -Property ('Name', 'Length','Get-FileVersionInfo') -PassThru |
    where-object { $_.SideIndicator -eq '=>'} | select Name, Length, LastWriteTime, VersionInfo
$three = $one + $two | sort-object -property Name | ConvertTo-HTML -Fragment 
# Get End Time
$endDTM = (Get-Date)
# Echo Time elapsed
$four = "Elapsed Time: $(($endDTM-$startDTM).totalseconds) seconds"
ConvertTo-HTML -Head $a -Body "$one $two $three $four" -Title "Output" | Out-File C:\output.html