Display HTML DIV color based on condition in ASP.NET Core MVC

Hi

I am trying to figure out how to write between inline expressions to display colors based on the condition 

<div class=" noPad" style="display: grid; grid-template-columns: 9fr 1fr;">
    <div class="glance-text">
        <div class="glance-lastDate">
            <%: Html.TranslateTag("Last Message","") %>  <%: item.Sensor.LastDataMessage == null ?  Html.TranslateTag("Unavailable","Unavailable") : (item.Sensor.LastCommunicationDate.ToElapsedMinutes() > 120 ? item.Sensor.LastCommunicationDate.OVToLocalDateTimeShort() : item.Sensor.LastCommunicationDate.ToElapsedMinutes().ToString()  + " " + Html.TranslateTag("Minutes ago","Minutes ago") ) %>
        </div>
    </div>
</div>

I would like to add colors in these syntaxes in the ascx file html when: 

<%: Html.TranslateTag("Last Message","") %>  <%: item.Sensor.LastDataMessage == null ?  Html.TranslateTag("Unavailable","Unavailable") :

Unavailable to be the red color with background color black

(item.Sensor.LastCommunicationDate.ToElapsedMinutes() > 120 ? item.Sensor.LastCommunicationDate.OVToLocalDateTimeShort() : 

date 15/07/2022 4:56 pm to be a blue color with background color white

item.Sensor.LastCommunicationDate.ToElapsedMinutes().ToString()  + " " + Html.TranslateTag("Minutes ago","Minutes ago") ) %>

2 Minutes ago to be an orange color with background color dark blue

C#

public DataMessage LastDataMessage
{
    get
    {
        try
        {
            if (LastDataMessageGUID != null && LastDataMessageGUID != Guid.Empty && LastCommunicationDate > DateTime.UtcNow.AddMonths(-12))
            {
                if (_LastDataMessage == null || _LastDataMessageGUID != _LastDataMessage.DataMessageGUID)
                {
                    _LastDataMessage = DataMessage.LoadLastBySensorQuick(SensorID, LastDataMessageGUID, LastCommunicationDate);
                }
 
            }
            return _LastDataMessage;
        }
        catch (Exception ex)
        {
            try
            {
                ExceptionLog.Log(ex);
            }
            catch
            {
            }
            return null;
        }
    }
    set
    {
        DataMessage.ClearLastBySensorQuick(SensorID);
        _LastDataMessage = value;
        if (value != null)
            this.LastDataMessageGUID = value.DataMessageGUID;
    }
}

Sincerely thanks.