2.2-AreaHunters/YJMPD-UWP/Themes/DefaultStyles.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:YJMPD_UWP.Themes">

    <Style TargetType="SymbolIcon" x:Key="InfoIcon">
        <Setter Property="Foreground" Value="Gray" />
    </Style>
    <Style TargetType="TextBlock" x:Key="InfoText">
        <Setter Property="Foreground" Value="Gray" />
        <Setter Property="FontSize" Value="16" />
        <Setter Property="Margin" Value="5,0,0,0" />
    </Style>

    <Style TargetType="TextBlock" x:Key="Header">
        <Setter Property="FontSize" Value="20" />
        <Setter Property="FontWeight" Value="Bold" />
        <Setter Property="Margin" Value="0,0,0,3" />
    </Style>
    
</ResourceDictionary>