diff --git a/c.scm b/c.scm
new file mode 100644
index 0000000..afbc055
--- /dev/null
+++ b/c.scm
@@ -0,0 +1,6 @@
+(use-modules (guix ci))
+
+(list (channel-with-substitutes-available
+        %default-guix-channel
+        "https://ci.guix.gnu.org")
+      )
diff --git a/home-config/alacritty/alacritty.yml b/home-config/alacritty/alacritty.yml
index becd2f6..4fbd991 100644
--- a/home-config/alacritty/alacritty.yml
+++ b/home-config/alacritty/alacritty.yml
@@ -1,3 +1,5 @@
+window:
+  opacity: 0.70
 font:
   size: 15
   normal: