Maple/Maple.App/App.xaml

<Application
    x:Class="Maple_App.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Maple_App">
    <Application.Resources>
        <ResourceDictionary>
            <Color x:Key="SystemAccentColor">#2ebe5a</Color>
        </ResourceDictionary>
    </Application.Resources>
</Application>