3 replaced http://magento.stackexchange.com/ with https://magento.stackexchange.com/
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Navigate to the folder dev/tools/Magento/Tools/View and run this in the command line.

php deploy.php

Else you check these links

http://magento.stackexchange.com/a/64808/594

http://magento.stackexchange.com/questions/64857/css-and-javascript-files-are-not-loading-after-magento-2-installation/65192#65192