readability of critical alerts

[HaveFun83]

Currently the critical alerts lacks readability as light gray front on red background are harder to read.

Looks like the decrease the opacity within the css can help here:

.status.red, .status.red summary, .status.red details {
     background-color: #FF4040;
     color: white;
-    opacity: 0.75;
+    opacity: 0.9;   
}

[BuJo]

Should be fixed with #108, I'll make a new release soon.