Edit C:\Windows\SystemResources\Windows.UI.Search\XAMLTemplates\Web.Fallback.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:tm="using:SearchUI.TemplateManager"
                    x:Key="Web.Fallback">
    <ResourceDictionary.ThemeDictionaries>
        <ResourceDictionary x:Key="Default">
            <SolidColorBrush x:Key="Local.ImagePlaceholderBackgroundBrush"
                             Color="#3B9B9B9B" />
            <SolidColorBrush x:Key="Local.ImagePlaceholderBorderBrush"
                             Color="#DDDDDD" />
        </ResourceDictionary>
        <ResourceDictionary x:Key="HighContrast">
            <SolidColorBrush x:Key="Local.ImagePlaceholderBackgroundBrush"
                             Color="{ThemeResource ImmersiveLightBackgroundColor}" />
            <SolidColorBrush x:Key="Local.ImagePlaceholderBorderBrush"
                             Color="{ThemeResource ImmersiveLightDisabledTextColor}" />
        </ResourceDictionary>
    </ResourceDictionary.ThemeDictionaries>

<tm:StringVector x:Key="Local.AutomationId">
        <x:String>@Web.Fallback__</x:String>
        <x:String>Extended:automation.Extended:Id</x:String>
    </tm:StringVector>

<DataTemplate x:Key="SerpFallbackTemplate.Horizontal">
        <Grid Style="{StaticResource TopLevelDataTemplateRootStyle}">
            <Grid.RowDefinitions>
                <RowDefinition Height="200" />
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" />
                <RowDefinition Height="*" />
            </Grid.RowDefinitions>
            
            <Grid Background="{ThemeResource Local.ImagePlaceholderBackgroundBrush}"
                  Grid.Row="0">
                <Image Stretch="UniformToFill"
                       Source="{Binding Extended:pagePreview.Extended:image.Extended:src}"
                       AutomationProperties.AutomationId="PagePreviewImage" />
                <Rectangle Style="{StaticResource Local.ImagePlaceholderRectangleStyle}" />
            </Grid>
            
            <TextBlock tm:RichText.Text="{Binding System_ItemNameDisplay}"
                       Grid.Row="1"
                       Margin="0, 20, 0, 5"
                       MaxLines="3"
                       TextWrapping="Wrap"
                       TextTrimming="WordEllipsis"
                       Style="{CustomResource TextStyle_MediumSmall_SemiLight}"
                       AutomationProperties.AutomationId="Title" />
            
            <TextBlock Grid.Row="2"
                       Margin="0, 0, 0, 5"
                       tm:RichText.Text="{Binding Extended:metadata.Extended:attribution.System_Search_Contents}"
                       MaxLines="2"
                       TextWrapping="NoWrap"
                       TextTrimming="WordEllipsis"
                       Foreground="{ThemeResource ImmersiveLightHighlightBrush}"
                       Style="{CustomResource TextStyle_Normal_Regular}"
                       AutomationProperties.AutomationId="DisplayUrl" />
            
            <TextBlock tm:RichText.Text="{Binding System_Search_AutoSummary}"
                       AutomationProperties.AutomationId="Snippet"
                       Grid.Row="3"
                       TextWrapping="Wrap"
                       TextTrimming="WordEllipsis"
                       Foreground="#FF777777"
                       Style="{CustomResource TextStyle_Normal_Regular}" />
        </Grid>
    </DataTemplate>

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