Stop using brightness

src/index.css

@@ -175,7 +175,7 @@ button,
 :is(button, .button).plain2 {
   background-color: transparent;
   color: var(--link-color);
-  backdrop-filter: blur(12px) invert(0.25) brightness(1.5);
+  backdrop-filter: blur(12px) invert(0.25);
 }
 :is(button, .button).plain3 {
   background-color: transparent;