Ionic really isn’t made for web development. Some people have used it for websites, but the Ionic team has stated that they only plan on supporting mobile apps. See this: http://ionicframework.com/docs/overview/#browser-support
Some components may not be supported in all browsers. This is a good post about deploying it as a website:
Ionic is capable of setting a fixed screen size (you can alter the width/height in the css), but it currently takes up 100% width/height of the device it is on, so I’m not sure why you would make it fixed.
If you are worried about browser support there are web frameworks, such as bootstrap or foundation, that you could use.