diff --git a/_src/assets/base.css b/_src/assets/base.css
index 9191422..6b2730d 100644
--- a/_src/assets/base.css
+++ b/_src/assets/base.css
@@ -64,7 +64,8 @@ pre, code, a { color: var(--lightgray); }
 body {
   margin: 0;
 	font-size: calc(.7em + .7vw);
-  background: url('/assets/img/space.jpg') repeat-y fixed 0 0/100%;
+  background: url('/assets/img/space.webp') repeat-y fixed 0 0/100%;
+  background-color: #111;
 }
 main {
   max-width: calc(100vh + 10vw);
diff --git a/_src/assets/img/space.jpg b/_src/assets/img/space.jpg
deleted file mode 100644
index fcbc3b2..0000000
Binary files a/_src/assets/img/space.jpg and /dev/null differ
diff --git a/_src/assets/img/space.webp b/_src/assets/img/space.webp
new file mode 100644
index 0000000..9234aab
Binary files /dev/null and b/_src/assets/img/space.webp differ