feat(fe): change brand text color in block page

blockpage/index.html

@@ -64,7 +64,7 @@
         bottom: 32px;
         left: 0;
         width: 100%;
-        color: #a8a8a8;
+        color: rgba(0, 0, 0, 0.3);
         font-size: 10px;
         text-align: center;
       }

blockpage/limited.html

@@ -63,7 +63,7 @@
         bottom: 32px;
         left: 0;
         width: 100%;
-        color: #a8a8a8;
+        color: rgba(0, 0, 0, 0.3);
         font-size: 10px;
         text-align: center;
       }

blockpage/maintaining.html

@@ -53,7 +53,7 @@
         bottom: 32px;
         left: 0;
         width: 100%;
-        color: #a8a8a8;
+        color: rgba(0, 0, 0, 0.3);
         font-size: 10px;
         text-align: center;
       }

blockpage/not_found.html

@@ -58,7 +58,7 @@
         bottom: 32px;
         left: 0;
         width: 100%;
-        color: #a8a8a8;
+        color: rgba(0, 0, 0, 0.3);
         font-size: 10px;
         text-align: center;
       }