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You can use a viewport height and width units: vh and vw, thus 100vh is equal 100% of viewport height. The solution is: section.sr { margin:0; padding:0; background-image: url(../images/simulation-1-waterfall.jpg); margin-top:...
For smartphones, etc, you could move the media queries from with-in the css files to the link elements as shown below. This way you're only loading a single css file...