在保持跨浏览器兼容的同时，以一定宽度居中标题并为其添加边距的最简单方法是什么？

I've a got a webpage that's built on a framework that claims its already cross browser compatible, however, I'm trying to customize with custom css, I want the headline to align to the center and not to be at 100% width.I've a got a webpage that's built on a framewor