How to make semi-transparent blocks

Want to achieve a nice transparent block, even without fade blocks? Well, you can!
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It’s a bit complicated. First, enter the info about your new category like normal (don’t save it yet, however!):

Now, click on the Snap! logo while holding shift and enable dev mode. Then, click on the category color box to get this menu:

Go to inspect, and click on color:

Now, double click the “rgba” to select it, and type new Color to replace it. Now, you should be able to chaange the last value to any number from 0-1. 0 is fully transparent, 1 is opaque. Finally, press OK to create the category.

If you create a block in that category, its transparent!
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Even exporting/importing it works. Don’t overuse this (probably just 0.8-0.9 type transparency), but it works!

I had also put together a custom block to do this more simply:

Decoding XML is actually a very clever way to do that!

Does not work in flat design...