Retain the colors and different style in Body of email

I have a macros that copies over a cell that has text in different colors and bold and plain type. When it pastes in the email, it is all one fixed font. See below for the code. I have attached an example of what I would like for the body of the email to look like. Any help is appreciated, Thanks!!

Sub SPANISH_MANUALTIME_EMAIL()

    Dim OutApp As Object
    Dim OutMail As Object
    Dim strbody As String
    Dim SigString As String
    Dim Signature As String
    Dim rng As Range
    
    Set rng = Sheets("EMAIL").Range("C3").SpecialCells(xlCellTypeVisible)
    
    Set OutApp = CreateObject("Outlook.Application")
    Set OutMail = OutApp.CreateItem(0)
        
        SigString = Environ("appdata") & _
     "\Microsoft\Signatures\Santander.htm"

    If Dir(SigString) <> "" Then
        Signature = GetBoiler(SigString)
    Else
        Signature = ""
    End If
    
    
    On Error Resume Next
    With OutMail
        .To = "@Serv: Frontend Managers"
        .CC = "My Team"
        .BCC = ""
        .Subject = Sheets("EMAIL").Range("B3")
        .htmlbody = "<style> .fixedfont {font-size : 11pt}</style> <font face=""+Body"" class=""fixedfont"">" & RangetoHTML(rng) & "<br><br>" & Signature
        .Display
    End With

End Sub