Is there a way to change the backgrount of the field to white? 

    var TestNameInput = new CuiElement
     {

              Name = "TestNameInput",
              Parent = "ATM",
              Components =
    {
        new CuiInputFieldComponent
        {
            Text = "0",
            CharsLimit = 90,
            Color = "0 0 0 1",
            IsPassword = false,
            Command = "example.exampleinputtextcb",
            Font = "robotocondensed-regular.ttf",
            FontSize = 19,
            Align = TextAnchor.MiddleLeft
        },
        new CuiRectTransformComponent
        {
                    AnchorMin = "0.18 0.15",
                    AnchorMax = "0.54 0.20"
        }

    }​

Just create some parent panel with Color "1 1 1 1" and place the input field inside with (full) anchors "0 0" "1 1" 

Thank you that worked great.