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Now you will se what's the trick is all about. We want our document to be 1200x1845 pixels. Now we want to have two guides that will center the area of 980 pixels. How to make it? Create a new document that is 1200px wide. Then divide this value by two so it will be 600px. Our design is 980px wide, we are dividing this value on two as well (490px) and then adding and subtracting it from documents center so we will have 600-490 and 600+490 which will give us 110px and 1090px. This could be problematic if someone can't count quickly in mind and have not round dimensions. Yet there is really easier way that I'm using everyday and it requires a minimum of math. We want 980px design with inside margins of 20px each side (for safety reasons). Thus we are making a document of 940x1845 px and adding guides on 0px and 100%.
Then we are going to Image > Canvas Size and typing 40px in width (with relative measuring checked) for we want 20px each side.
And again we're adding guides on 0 and 100%. Then we are going once again to Image > Canvas size, but this time we are leaving relative unchecked and typing 1200px in width. Quickly and with minimalized possibility of mistake. And we have our blank document done. It is 1200x1845px as we wanted and have centered area out bounded by guides.
Step 2 - Noisy background
It's going to be pretty easy step. Noisy backgrounds are quite popular these days (hmpf) and you probably have done more than one before this, but anyway I will show you how I am achieving them. Noisy backgrounds make design a bit grungy and they perfectly fit to solid colored shapes. Truly, they are overused. You can see them in most of modern designs. However, if they were bad, they wouldn't be used, right? Slight noise is really old trick, and it didn't came as design trend of 2008 or 2009. It is old as... it's just really old. Every digital painter knows the power of texturing which noise is really simple kind of. And texturing in web design existed for a long of time as well. I think noises gets massive because of it's ease of creation. Not only you get texture, it is also seamless, for sure. Alright, let's make some noisy pixels. First of all, create a new layer and fill the whole area (SHIFT+F5 / Edit > Fill) with some light color like #efefef. Then go to (surprisingly?) Filter > Noise > Add Noise and type into input box something like 2.5px, set distribution to uniform and check monochromatic. Then go to Filter > Blur > Gaussian Blur and use 0.5 pixels radius. And that's it.