replace deprecated slash division with math division in Sass

Change-Id: I664c367e06eb166f74197ac50ef90dc24a7b5ef9
diff --git a/dev/scss/main/pagination.scss b/dev/scss/main/pagination.scss
index d09162d..f261fc7 100644
--- a/dev/scss/main/pagination.scss
+++ b/dev/scss/main/pagination.scss
@@ -1,4 +1,5 @@
 @charset "utf-8";
+@use 'sass:math';
 @import "../util";
 
 /**
@@ -22,8 +23,8 @@
    */
     position:    fixed;
     font-size:   0;
-    right:       ($standard-margin / 4);
-    bottom:      ($standard-margin / 2);
+    right:       math.div($standard-margin,4);
+    bottom:      math.div($standard-margin,2);
     z-index:     35;
     padding:     0;
     height:      auto;