I will give you a detailed analysis of the Illustrator software and share the tutorial on modifying the stroke size and color.
Tutorial sharing:
1. Select the rectangle tool to draw the desired rectangle. As shown in the following figure:
2. In the lower left corner of the toolbar, find the stroke tool, as shown in the following figure. Double-click the tool to change the color of the rectangle.
3. On the top of the AI page, find the word stroke to change the stroke size.
4. Set the desired stroke size, as shown in the following figure:
5. AI can quickly modify the stroke size and color. When there are multiple rectangles, remember to select the selection tool and then modify it.
All right, the above information is a detailed tutorial on modifying the stroke size and color for the users of Illustrator's software, users now see the small editor here. I believe that everyone is very clear about the method of drawing, so everyone will try the effect according to the tutorials shared by the small editor.