I am trying to upload this image to Slack's custom emoji feature for my work: 
When I go to upload this image as a custom slack emoji, the image becomes shrunk and surrounded with a dark background, making the image hard to see.
I've tried many things, including using different file formats and shrinking the image to lesser and lesser size. Currently, the image is in PNG format and is 150x150 pixels, yet it still will not work.
How can I maximize the custom emoji space for new emojis ?
