Hiya!
Answer & Step-By-Step Explanation
So, the user needs to add a thick and dark green border around a chart in PowerPoint, right? Well, the darkness and thickness aren't really important because it's based on what the user needs.
Now, into the nitty-gritty. "How do I do it"? After creating or clicking on your chart, you want to go the top menu strip. You should see Chart Tools with two options; Design and Format. You want to click the Format.
From there, you'll see a Current Selection toolset, Insert Shapes toolset, and then the Shape Styles toolset. From there you will find the Shape Outline option. Click that, choose your color (in the case of the answer, it's a dark green color).
Finally, to get the thickness of the border. Below the colors that you just selected, there is an option known as Weight. Click that, and set the thickness based on the options.
And you're done! Ta-Da!
I hope my answer helped answer your question.
