How to make my website fit all screen sizes?

I was wondering how do I make my website fit all screen sizes, such as Iphone, Tablets, Laptops and desktops. I created my website on desktop, when I view it on tablet or iphone the images and texts are overlapping each other. How do I fix that?

You can't, easily. You have to pick a common resolution that works for most devices, like a 770 pixel width, for example, or you need to use different stylesheets to arrange things differently for different screens.

How to create flexible sites quickly using standards like CSS and XHTML: http://www.ibm.com/developerworks/web/library/wa-rapid/
Designing for the Web: Resolution and Size: http://sitepointcom.createsend4.com/t/y/l/ydlyuyd/birtthtw/h/
Care With Font Size: http://www.w3.org/QA/Tips/font-size

Websites Shouldn't Look The Same Across Different Browsers: http://www.noupe.com/design/websites-shouldnt-look-the-same-across-different-browsers%E2%80%A6here-is-why.html
Cross-Browser CSS in Seconds with Prefixr: http://net.tutsplus.com/articles/news/cross-browser-css-in-seconds-with-prefixr/
Responsive Web Design Demystified: http://www.elated.com/articles/responsive-web-design-demystified/
Responsive Web Design: 5 Handy Tips: http://www.elated.com/articles/responsive-web-design-5-handy-tips/

responsivepx - screen-size testing tool: http://responsivepx.com/

FitText.js plugin (FitText is a jQuery plugin that makes your font-sizes flexible, allowing headlines to automatically-expand to fit the available space): http://fittextjs.com/
Adapt.js - Adaptive CSS: http://adapt.960.gs/

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