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You can easily create a page like this using WordPress’ native gallery function. Just click on Add Media button in page editor,
then click the Create Gallery button, select your images and you’re done. In Settings – Media you can change the thumbnail sizes.
The current setting here is 250*150px. But after changing it you’ll need to regenerate your already uploaded images! Tip: there’s a plugin for that! ?
This theme also has a built-in image viewer. Click on an image to see it!