I have two DIVs one contain new release and must, another one contain whole data.
both div have a red border. I remove bottom border of first div.
I want to remove the border where I marked with red rectangle:

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You can create another div to occupy the space to the right of the “Must” tab. Set this div’s bottom border to “1px solid red”. Then, remove the border-top from the news box, and the border-bottom from the tabs themselves.