diff --git a/install.py b/install.py
index ff32d963..4f972abf 100755
--- a/install.py
+++ b/install.py
@@ -34,6 +34,14 @@
 TARGET_NORMAL = "~/.steam/steam"
 TARGET_FLATPAK = "~/.var/app/com.valvesoftware.Steam/.steam/steam"
 
+STEAM_LOOPBACK = "https://steamloopback.host"
+STEAM_PATCHED_HEADER = "/*patched*/"
+
+STEAM_FRIENDS_CSS = "clientui/css/friends.css"
+STEAM_LIBRARY_CSS = "steamui/css/library.css"
+STEAM_CUSTOM_LIBRARY = "steamui/libraryroot.custom.css"
+STEAM_CUSTOM_FRIENDS = "clientui/friends.custom.css"
+
 skindir = Path(SKIN_DIR)
 patchdir = Path(PATCH_DIR)
 webthemedir = Path(WEB_THEME_DIR)
@@ -208,6 +216,47 @@ def install(source: Path, target: Path, name: str):
 		shutil.rmtree(target_skin)
 	shutil.copytree(source, target_skin)
 
+def patch_client_css(source: Path, target: Path, name: str):
+	if args.no_steam_patch or args.web_theme == "none":
+		return
+
+	print(f"{TEXT_BLUE}{TEXT_ARROW} Patching Steam Client {TEXT_BOLD}{name}{TEXT_RESET}{TEXT_BLUE} Files...{TEXT_RESET}")
+
+	if not target.is_dir():
+		print(f"{TEXT_PURPLE}{TEXT_INFO} Directory {TEXT_BOLD}{target}{TEXT_RESET}{TEXT_PURPLE} does not exist{TEXT_RESET}")
+		return
+
+	if name == "Library":
+		target_css = target / STEAM_LIBRARY_CSS
+		custom_css = target / STEAM_CUSTOM_LIBRARY
+		custom_css_name = custom_css.name
+	elif name == "Friends":
+		target_css = target / STEAM_FRIENDS_CSS
+		custom_css = target / STEAM_CUSTOM_FRIENDS
+		custom_css_name = custom_css.name
+	else:
+		raise SystemExit(f"{TEXT_RED}{TEXT_CROSS} Invalid steam css patch selected: {name}{TEXT_RESET}")
+
+	if not target_css.exists():
+		print(f"{TEXT_PURPLE}{TEXT_INFO} File {TEXT_BOLD}{target_css}{TEXT_RESET}{TEXT_PURPLE} does not exist{TEXT_RESET}")
+		return
+
+	with target_css.open() as css_file:
+		if css_file.readline().strip() == STEAM_PATCHED_HEADER:
+			return
+
+	orig_css = target_css.rename(target_css.with_suffix(".original.css"))
+	name = target_css.stem
+	css_dir = "css"
+	content = f'{STEAM_PATCHED_HEADER}\n@import url("{STEAM_LOOPBACK}/{css_dir}/{name}.original.css");\n@import url("{STEAM_LOOPBACK}/{custom_css_name}");\n'
+	target_css.open('w').write(content)
+
+	size_diff = orig_css.stat().st_size - target_css.stat().st_size
+	padding = "\t" * size_diff
+	target_css.open('a').write(padding)
+
+	shutil.copyfile(source / CSS_FILE, custom_css)
+
 if __name__ == "__main__":
 	if not skindir.exists():
 		raise SystemExit(f"{TEXT_RED}{TEXT_CROSS} Skin directory {TEXT_BOLD}{SKIN_DIR}{TEXT_RESET}{TEXT_RED} does not exist. Make sure you're running the installer from its root directory{TEXT_RESET}")
@@ -222,6 +271,7 @@ def install(source: Path, target: Path, name: str):
 	parser.add_argument("-l", "--list-options", action = "store_true", help = "List available patches, themes, web extras and exit")
 	parser.add_argument("-p", "--patch", nargs = "+", action = "extend", help = "Apply one or multiple patches")
 	parser.add_argument("-n", "--name", default = SKIN_DIR, help = "Rename installed skin")
+	parser.add_argument("-nsp", "--no-steam-patch", action = "store_true", help = "Do not patch steam files")
 	parser.add_argument("-w", "--web-theme", choices = ["base", "full", "none"], default = "base", help = "Choose web theme variant")
 	parser.add_argument("-we", "--web-extras", nargs = "+", action = "extend", help = "Enable one or multiple web theme extras")
 	args = parser.parse_args()
@@ -302,4 +352,6 @@ def install(source: Path, target: Path, name: str):
 
 		for target in targets:
 			install(sourcedir, target, args.name)
+			patch_client_css(sourcedir, target, "Library")
+
 		print(f"{TEXT_GREEN}{TEXT_CHECK} Done!{TEXT_RESET}")