override.css

nav a div div,
nav div div div {
  font-size: 16px !important;
  font-weight: 400 !important;
  line-height: 1.3 !important;
}

div[aria-label="Timeline: Trending now"] {
  display: none;
}

a[aria-label="Tweet"] {
  display: none;
}

aside[aria-label="Who to follow"] {
  opacity: 0.6;
}

h2 div {
  font-weight: 400 !important;
}

header {
  margin-left: -7vw !important;
}

div[data-testid="primaryColumn"] {
  border-color: rgba(40, 40, 40, 0.35) !important;
  max-width: 650px !important;
  box-shadow: 0 0 20px 6px rgba(0, 0, 0, 0.25);
}

div[aria-label="Timeline: Conversation"]
  > div
  > div
  > div
  > div
  > div
  > div[role="button"] {
  padding: 0 0 20px 40px;
}

body {
  font-family: "Avenir", Helvetica, Arial, sans-serif !important;
  -webkit-font-smoothing: antialiased !important;
  -moz-osx-font-smoothing: grayscale !important;
}

span,
div,
article,
aside,
main {
  font-family: "Avenir", Helvetica, Arial, sans-serif !important;
  -webkit-font-smoothing: antialiased !important;
  -moz-osx-font-smoothing: grayscale !important;
  letter-spacing: 0.01em;
}

article {
  font-size: 17px;
  max-width: 650px !important;
  transition: none !important;
}

article[role="article"] > div {
  padding: 10px 15px 20px !important;
}

article div div div div {
  font-size: 17px !important;
  line-height: 1.5;
}

header div div div div div {
  padding: 12px 0;
}

div[aria-live="polite"] {
  padding: 2px;
  font-size: 12px !important;
  line-height: 1.2em !important;
  top: -15px;
  right: -10px;
  width: 22px !important;
  height: 22px !important;
  text-align: center !important;
}

div[aria-live="polite"][aria-label="20+ unread items"] {
  width: 32px !important;
  height: 21px !important;
  right: -20px !important;
  padding-top: 4px !important;
}

div[role="blockquote"] {
  padding: 10px;
}

article div div a + div:empty {
  background: linear-gradient(rgb(242, 101, 102, 0.8), #1d1f33);
}

div[data-testid="sidebarColumn"] {
  visibility: hidden !important;
  width: 125px !important;
}

form[aria-label="Search Twitter"][role="search"] {
  visibility: visible !important;
  position: fixed !important;
  width: 270px !important;
  top: 8px;
  right: 20px;
}

div[aria-modal="true"] div div div div div div div div div div div div div {
  border: 0 !important;
  border-width: 0 !important;
}

div[data-testid="tweet"] > div > div:first-child:empty {
  display: none !important;
}

a[aria-label="Profile"] img {
  width: 30px;
  height: 30px;
  position: absolute;
  opacity: 1;
}

svg[aria-label="Verified account"] {
  /* lol */
  display: none;
}

div[role="menu"],
div[aria-label="New Tweets are available. Push period to go to the beginning of your timeline and view them"] {
  /* get rid of that weird glowy box-shadow on dim mode, damn */
  box-shadow: 0 0 8px 3px rgba(0, 0, 0, 0.3) !important;
}

article[data-testid="tweetDetail"] > div:first-child {
  display: none;
}

main[role="main"] > div {
  width: 900px;
}

div[data-testid="DMDrawer"] {
  visibility: hidden
}

header[role="banner"] div[role="presentation"] div:last-child {  
  /* fix avatar picture */
  width: 40px;
  height: 40px;
}