Claim 1: white-ish lines on light grey paper.

Claim 2: As above, but more closely matching white and grey.

Claim 3: Either of the above but with a slightly colored paper instead of gray.

"On Whitelines there is no visual interference between the lines and the pen colour."

So, the lines on the paper are different depending on the color of the ink I'm writing with?

I always end up going to Wikipedia to understand what the company is selling.

    .line {
        background: rgb(233, 233, 233);
        height: 3.125em;
        border: 0.25em solid white;
        width: 100%;    
    }