add translucent background to header logo

To improve readability

hacktheplanet/login/resources/css/login.css

@@ -92,6 +92,8 @@ div.kc-logo-text span {
     line-height: 1.2em;
     padding: 62px 10px 20px;
     white-space: normal;
+    display: inline-block;
+    background-color: #11111173;
 }
 
 #kc-content {