fix: corrected centering on FF

assets/css/landing.css

@@ -177,7 +177,7 @@
     width: 100%;
     height: calc(var(--title-height) - var(--card-title-padding));
     padding-top: var(--card-title-padding);
-    text-align: -webkit-center;
+    text-align: center;
     vertical-align: middle;
     font-size: 14pt;
 }
@@ -221,7 +221,7 @@
     padding: 4px 0px;
     font-size: smaller;
     color: #777;
-    text-align: -webkit-center;
+    text-align: center;
 }
 .card-pinned.card-red > .card-header {
     border-color: var(--red-color);