CourseProject_ended/Hotel_Course_Project/App.xaml.cs

using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace Hotel_Course_Project
{
    /// <summary>
    /// Логика взаимодействия для App.xaml
    /// </summary>
    public partial class App : Application
    {
        private void MouseEnter(object sender, System.Windows.Input.MouseEventArgs e)
        {
            ((Border)sender).Background = new SolidColorBrush(Color.FromRgb(120, 125, 124));
        }

        private void MouseLeave(object sender, System.Windows.Input.MouseEventArgs e)
        {
            ((Border)sender).Background = new SolidColorBrush(Color.FromRgb(79, 88, 86));
        }
    }
}