html text elements in mobile browser looks narrow

[fragov]

I've got a problem with a website. I'm trying to make it compatible with mobile browsers.The text elements such as h1 ,h2, p look narrow on Android devices (on iOS it seems to work properly) instead of occupy all the free space. I have set the width of the elements but the problem persists and on mobile browser it gets ignored.Can anyone help me with this problem?Thank you