fix: improve pdf header code readability

resources/views/pdf/exam-grading.blade.php

@@ -30,8 +30,13 @@
             }
             @top-right {
                 content: "{{ $gradingCode }}";
-                font-size: 13px;
-                color: #666;
+                font-size: 17px;
+                font-weight: 600;
+                font-family: "Noto Sans", "Liberation Sans", "Nimbus Sans", sans-serif;
+                letter-spacing: 0;
+                padding-right: 3mm;
+                padding-top: 1.2mm;
+                color: #222;
             }
             @bottom-left {
                 content: "{{ $gradingCode }}";

resources/views/pdf/exam-paper.blade.php

@@ -29,8 +29,13 @@
             }
             @top-right {
                 content: "{{ $examCode }}";
-                font-size: 13px;
-                color: #666;
+                font-size: 17px;
+                font-weight: 600;
+                font-family: "Noto Sans", "Liberation Sans", "Nimbus Sans", sans-serif;
+                letter-spacing: 0;
+                padding-right: 3mm;
+                padding-top: 1.2mm;
+                color: #222;
             }
             @bottom-left {
                 content: "{{ $examCode }}";

resources/views/pdf/partials/kp-explain-styles.blade.php

@@ -16,8 +16,13 @@
         }
         @top-right {
             content: "{{ $examCode }}";
-            font-size: 13px;
-            color: #666;
+            font-size: 17px;
+            font-weight: 600;
+            font-family: "Noto Sans", "Liberation Sans", "Nimbus Sans", sans-serif;
+            letter-spacing: 0;
+            padding-right: 3mm;
+            padding-top: 1.2mm;
+            color: #222;
         }
         @bottom-left {
             content: "{{ $examCode }}";