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<img src="http://payload407.cargocollective.com/1/5/168024/10457850/SeriousBaby_Meme_Goodbye_FB_1000.jpg">
Blu's link with code to size it:
<img src="http://payload407.cargocollective.com/1/5/168024/10457850/SeriousBaby_Meme_Goodbye_FB_1000.jpg"width=400>
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There are a few different ways of coding to size images - this is the one I use. I first try sizing it around 300 or 400 and then based on how it looks, increase or decrease the numbers. I usually change the size in increments of 100 (i.e., 300, 400, 500) but you can pick numbers in between.