People extra improvements

src/components/PageBody/index.svelte

@@ -25,5 +25,6 @@
   .head {
     top: 0px;
     z-index: 1;
+    background-color: #fafbfc;
   }
 </style>

src/routes/courses/[id]/people.svelte

@@ -137,7 +137,7 @@
               class="mr-2 w-20 text-center hover:bg-gray-100 p-3"
               on:click={() => (shouldEditMemberId = true)}
             >
-              {person.assigned_student_id || index + 1}
+              {person.assigned_student_id || '-'}
             </p>
           {:else}
             <TextField