OBS（https://obsproject.com） で YouTube Live のチャットをオーバーレイする時に使用する CSS。

yt-chat-overlay.css

@import url("https://fonts.googleapis.com/css?family=Noto Sans");

/* Background colors*/
body {
  background-color: rgba(0,0,0,0);
  line-height: 1.5 !important;
}

/* Transparent background. */
yt-live-chat-renderer {
  background-color: transparent !important;
}

/* Outlines */
yt-live-chat-renderer * {
  text-shadow: -2px -2px #2a2a2a,-2px -1px #2a2a2a,-2px 0px #2a2a2a,-2px 1px #2a2a2a,-2px 2px #2a2a2a,-1px -2px #2a2a2a,-1px -1px #2a2a2a,-1px 0px #2a2a2a,-1px 1px #2a2a2a,-1px 2px #2a2a2a,0px -2px #2a2a2a,0px -1px #2a2a2a,0px 0px #2a2a2a,0px 1px #2a2a2a,0px 2px #2a2a2a,1px -2px #2a2a2a,1px -1px #2a2a2a,1px 0px #2a2a2a,1px 1px #2a2a2a,1px 2px #2a2a2a,2px -2px #2a2a2a,2px -1px #2a2a2a,2px 0px #2a2a2a,2px 1px #2a2a2a,2px 2px #2a2a2a;
  font-family: "Noto Sans";
  font-size: 16px !important;
}

yt-live-chat-text-message-renderer #content,
yt-live-chat-legacy-paid-message-renderer #content {
  overflow: initial; !important
}

/* Hide scrollbar. */
yt-live-chat-item-list-renderer #items{
  overflow: hidden !important;
}

yt-live-chat-item-list-renderer #item-scroller{
  overflow: hidden !important;
}

/* Hide header and input. */
yt-live-chat-header-renderer,
yt-live-chat-message-input-renderer {
  display: none !important;
}

/* Reduce side padding. */
yt-live-chat-text-message-renderer,
yt-live-chat-legacy-paid-message-renderer {
    padding-left: 4px !important;
  padding-right: 4px !important;
}

yt-live-chat-paid-message-renderer #header {
    padding-left: 4px !important;
  padding-right: 4px !important;
}

/* Avatars. */
yt-live-chat-text-message-renderer #author-photo,
yt-live-chat-paid-message-renderer #author-photo,
yt-live-chat-legacy-paid-message-renderer #author-photo {
  
  width: 24px !important;
  height: 24px !important;
  border-radius: 24px !important;
  margin-right: 6px !important;
}

/* Hide badges. */
yt-live-chat-text-message-renderer #author-badges {
  display: none !important;
  vertical-align: text-top !important;
}

/* Timestamps. */
yt-live-chat-text-message-renderer #timestamp {
  
  color: #999999 !important;
  font-family: "Noto Sans";
  font-size: 16px !important;
  line-height: 16px !important;
}

/* Badges. */
yt-live-chat-text-message-renderer #author-name[type="owner"],
yt-live-chat-text-message-renderer yt-live-chat-author-badge-renderer[type="owner"] {
  color: #ffd600 !important;
}

yt-live-chat-text-message-renderer #author-name[type="moderator"],
yt-live-chat-text-message-renderer yt-live-chat-author-badge-renderer[type="moderator"] {
  color: #5e84f1 !important;
}

yt-live-chat-text-message-renderer #author-name[type="member"],
yt-live-chat-text-message-renderer yt-live-chat-author-badge-renderer[type="member"] {
  color: #0f9d58 !important;
}

/* Channel names. */
yt-live-chat-text-message-renderer #author-name {
  color: #cccccc !important;
  font-family: "Noto Sans";
  font-size: 18px !important;
}

yt-live-chat-text-message-renderer #author-name::after {
  content: ":";
  margin-left: 2px;
}

/* Messages. */
yt-live-chat-text-message-renderer #message,
yt-live-chat-text-message-renderer #message * {
  color: #ffffff !important;
  font-family: "Noto Sans";
  font-size: 16px !important;
}


/* SuperChat/Fan Funding Messages. */
yt-live-chat-paid-message-renderer #author-name,
yt-live-chat-paid-message-renderer #author-name *,
yt-live-chat-legacy-paid-message-renderer #event-text,
yt-live-chat-legacy-paid-message-renderer #event-text * {
  color: #ffffff !important;
  font-family: "Noto Sans";
  font-size: 18px !important;
}

yt-live-chat-paid-message-renderer #purchase-amount,
yt-live-chat-paid-message-renderer #purchase-amount *,
yt-live-chat-legacy-paid-message-renderer #detail-text,
yt-live-chat-legacy-paid-message-renderer #detail-text * {
  color: #ffffff !important;
  font-family: "Noto Sans";
  font-size: 16px !important;
}

yt-live-chat-paid-message-renderer #content,
yt-live-chat-paid-message-renderer #content * {
  color: #ffffff !important;
  font-family: "Noto Sans";
  font-size: 16px !important;
}

yt-live-chat-paid-message-renderer {
  margin: 4px 0 !important;
}

yt-live-chat-legacy-paid-message-renderer {
  background-color: #0f9d58 !important;
  margin: 4px 0 !important;
}

yt-live-chat-text-message-renderer a,
yt-live-chat-legacy-paid-message-renderer a {
  text-decoration: none !important;
}

yt-live-chat-text-message-renderer[is-deleted],
yt-live-chat-legacy-paid-message-renderer[is-deleted] {
  display: none !important;
}

yt-live-chat-ticker-renderer {
  background-color: transparent !important;
  box-shadow: none !important;
}
yt-live-chat-ticker-renderer {
  display: none !important;
}


yt-live-chat-ticker-paid-message-item-renderer,
yt-live-chat-ticker-paid-message-item-renderer *,
yt-live-chat-ticker-sponsor-item-renderer,
yt-live-chat-ticker-sponsor-item-renderer * {
  color: #ffffff !important;
  font-family: "Noto Sans";
}

@keyframes anim {
0% { opacity: 0; transform: translateX(-16px); }
100% { opacity: 1; transform: none;}
}

yt-live-chat-text-message-renderer,
yt-live-chat-legacy-paid-message-renderer {
  animation: anim 1000ms;
  animation-fill-mode: both;
}