got rid of scss error

src/App/App.scss

@@ -3,7 +3,7 @@ $background: #E4FFF7;
 @function textShadow($precision, $size, $color){
   $value: null;
   $offset: 0;
-  $length: $size * (1 / $precision) - 1;
+  $length: $size * calc(1 / $precision) - 1;
 
   @for $i from 0 through $length {
     $offset: $offset + $precision;
@@ -100,7 +100,7 @@ $background: #E4FFF7;
 
 @for $item from 1 through 21 {
   span:nth-of-type(#{$item}){ 
-    animation-delay: #{(3 + ($item/10))}s; 
+    animation-delay: #{(3 + (calc($item / 10)))}s; 
   }
 }