You wish to make the border of the tables in your knowledge base thicker. You can use the below solution to change the thickness and color of your table border across your knowledge base.

Solution

1. Go to Settings -> Knowledge base site -> Custom CSS & JavaScript, and Custom CSS

2. Paste the below CSS snippet in the window

table td, table th, table tr {
border: 3px solid #000000 !important;
}

3. Update the desired thickness and color in the snippet. In the provided example, thickness is 3px and color code is 000000

4. Click Save

Outcome

Before

By default, the table appears as below

After

After updating the Custom CSS, the table appears as below.