Main Page With Css

MainPage-css.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:StyledApp"
             x:Class="StyledApp.MainPage">
    <ContentPage.Resources>
        <StyleSheet Source="Styles/MainPage.css"/>
    </ContentPage.Resources>
    <StackLayout>
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="1*"/>
                <ColumnDefinition Width="3*"/>
            </Grid.ColumnDefinitions>
            <Label Grid.Column="0"
                   Text="Label near text field"/>
            <Button Grid.Column="1"
                    Text="Some Button Text"/>
        </Grid>
        <Label Text="Welcome to Styled Xamarin.Forms!"
               HorizontalOptions="Center"
               VerticalOptions="CenterAndExpand"/>
        <Button Text="Next Important Text"/>
    </StackLayout>

</ContentPage>