Due to the way 42k is coded, some of the values are locked in and simply deleting them then saving doesnt work. The old values will come back!

One thing that this effects are borders. To give you an example, on the container, there is a 1px #C9C9B5 (light grey) border. You can see the admin control panel for this below; which is at 42k Theme Options/Page And Container:

So what if we want to get rid of the border completely? Well on some programs you would just delete the color value and that would be fine, but on 42k you cannot do this. If you delete the color value and then hit save, the value will just come back.

Simply what you need to do is change the width to 0px wide, as seen in the image below.

No more border!

Of course if you just want to change the color of the border, then all you need to do is change the color value. You can also change the width to something thicker by raising the number, or even changing the border type if you prefer something different to the default solid lines.