If you are working with a word file with page borders, but you do not like the color of the borders, you can either follow the steps below to change the color, or to replace them with the art borders.
Step 1: Click the "Design" tab from the ribbon;
Step 2: Click "Page Borders" in the "Page Background" area;
Step 3: In the "Borders and Shading" window, select the color you like from the "Color" box. The preview box will automatically display the borders with the new color;
Step 4: Click "OK" to finish.
If you only want to change the border color on the first page, please refer to how to add borders to first page only.