Generated project

src/main/java/com/example/Application.java

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+package com.example;
+
+import com.vaadin.flow.theme.aura.Aura;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+import com.vaadin.flow.component.dependency.StyleSheet;
+import com.vaadin.flow.component.page.AppShellConfigurator;
+import com.vaadin.flow.component.page.Push;
+
+@SpringBootApplication
+@StyleSheet(Aura.STYLESHEET)
+@StyleSheet("styles.css") // Your custom styles
+@Push
+public class Application implements AppShellConfigurator {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+
+}

src/main/resources/META-INF/resources/styles.css

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+/* Add your styles here */

src/main/resources/application.properties

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+server.port=${PORT:8080}
+logging.level.org.atmosphere=warn
+
+# Launch the default browser when starting the application in development mode
+vaadin.launch-browser=true
+
+# To improve the performance during development.
+# For more information https://vaadin.com/docs/latest/flow/integrations/spring/configuration#special-configuration-parameters
+vaadin.allowed-packages=com.vaadin,org.vaadin,com.flowingcode,com.example