Fix style.

frontend/src/app/components/header/header.component.scss

@@ -62,11 +62,10 @@ $headerHeight: 3.5em;
     
                 .title {
                     font-size: 1.5em;
-                    opacity: 0;
+                    display: none;
-                    transition: opacity .2s ease-in-out;
 
                     @media screen and (min-width: 600px) {
-                        opacity: 1;
+                        display: block;
                     }
                 }
             }