set mobile threshold slightly wider than the board size

style/main.scss

@@ -7,6 +7,8 @@ $grid-row-cells: 4;
 $tile-size: ($field-width - $grid-spacing * ($grid-row-cells + 1)) / $grid-row-cells;
 $tile-border-radius: 3px;
 
+$mobile-threshold: $field-width + 20px;
+
 $text-color: #776E65;
 $bright-text-color: #f9f6f2;
 
@@ -379,13 +381,13 @@ hr {
         font-size: 45px;
 
         // Media queries placed here to avoid carrying over the rest of the logic
-        @include smaller(480px) {
+        @include smaller($mobile-threshold) {
           font-size: 25px;
         }
       } @else if $power >= 1000 {
         font-size: 35px;
 
-        @include smaller(480px) {
+        @include smaller($mobile-threshold) {
           font-size: 15px;
         }
       }
@@ -401,7 +403,7 @@ hr {
 
     font-size: 30px;
 
-    @include smaller(480px) {
+    @include smaller($mobile-threshold) {
       font-size: 10px;
     }
   }
@@ -452,7 +454,7 @@ hr {
   margin-top: 50px;
 }
 
-@include smaller(480px) {
+@include smaller($mobile-threshold) {
   // Redefine variables for smaller screens
   $field-width: 280px;
   $grid-spacing: 10px;