I use a red-light filter, so I find the yellow highlight on a white background to be hard to see. So I wrote custom CSS with the Stylus extension to change those colors.

Unfortunately the HTML is minified/obfuscated, but it's not too hard to find the appropriate selectors by guess and check.

```
.b-ib-zR.b-ib-zR-PS { /* select highlight */
background-color: #c3ffe7 !important;
}

.b-ib-zR.b-ib-zR-RR { /* hover highlight */
background-color: #e4fff8;
}

/* #e4eef8 is the RTM "notebook" background color*/
```