fix StaffCredit styles

src/client/styles/scss/_staff_credit.scss

@@ -10,30 +10,37 @@
   margin: 10vh 10vw !important;
 
   // see https://css-tricks.com/old-timey-terminal-styling/
-  @mixin old-timey-terminal-styling() {
+  .credit-curtain {
+    padding-top: 80vh;
+
     text-shadow: 0 0 10px #c8c8c8;
     background-color: black;
     background-image: radial-gradient(rgba(50, 100, 100, 0.75), black 120%);
   }
+  &::after {
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    content: '';
+    background: repeating-linear-gradient(0deg, rgba(black, 0.15), rgba(black, 0.15) 2px, transparent 2px, transparent 4px);
+  }
 
   h1,
   h2,
   h3,
   h4,
   h5,
-  h6 {
+  h6,
+  .dev-position,
+  .dev-name {
     font-family: 'Press Start 2P', $font-family-for-staff-credit;
     color: white;
   }
 
   $credit-length: -240em;
 
-  // see https://css-tricks.com/old-timey-terminal-styling/
-  .credit-curtain {
-    padding-top: 80vh;
-    @include old-timey-terminal-styling();
-  }
-
   h1 {
     font-size: 3em;
   }