Stylish for Chrome: https://chrome.google.com/webstore/detail/stylish-custom-themes-for/fjnbnpbmkenffdnngjfgmeleoegfcffe?hl=en

Stylish Twitter fix

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    background-color: white;
}

.css-18t94o4.css-1dbjc4n.r-1niwhzg.r-1ccsd61.r-sdzlij.r-1phboty.r-rs99b7.r-ero68b.r-vkv6oe.r-1ny4l3l.r-thmkab.r-o7ynqc.r-6416eg.r-lrvibr span {
	color: black !important;
}

.css-18t94o4.css-1dbjc4n.r-14lw9ot.r-42olwf.r-sdzlij.r-1phboty.r-rs99b7.r-ero68b.r-vkv6oe.r-1ny4l3l.r-thmkab.r-o7ynqc.r-6416eg.r-lrvibr {
    background-color: black;
    border: thin solid white;
}

.css-18t94o4.css-1dbjc4n.r-14lw9ot.r-42olwf.r-sdzlij.r-1phboty.r-rs99b7.r-ero68b.r-vkv6oe.r-1ny4l3l.r-thmkab.r-o7ynqc.r-6416eg.r-lrvibr span {
	color: white !important;
}