References: https://www.baeldung.com/thymeleaf-in-spring-mvc https://www.w3schools.com/w3css/defaulT.asp https://www.baeldung.com/spring-boot-war-tomcat-deploy https://www.javacodegeeks.com/2019/10/deploy-spring-boot-application-aws-ec2-instance.html https://www.w3schools.com/howto/howto_js_popup_form.asp