Additions atop https://userstyles.org/styles/173595/better-twitter-redesign

better-new-twitter.css

/* don't make right sidebar sticky */
[data-testid=sidebarColumn] > div > div:nth-child(2) {
    position: absolute;
}

/* dull out the empty space. Hardcoded colors for white theme. */

[data-testid='primaryColumn'] {
    background:#e6ecf0;
}


/* brighten the primary content. Hardcoded colors for white theme. */

[data-testid='primaryColumn'] > div > div > div {
    background: white;
    padding-left: 2em;
    padding-right: 2em;
}

Just wanna start of with thank you for making this <3

I have cleared twitter cache and re logged. Sadly these 2 things persist through the skin. Even with re-enabling the sidebar part it doesn't fix it. Sidebar has the off colored box and then the thin off colored line at the top before the tweets are what I'm talking about.

Hi.

You should go to the userstyles.org link and install the styles from there. I haven't made those styles.

These are just my additions on top of that, so you need to have them first. Also note that my additions in this gist may not work with black twitter themes because I've hardcoded colors for the white theme.