add prefix for flexbox. code review by XWG

@@ -31,8 +31,11 @@ $basicBtnC:#eb0313;
             margin-bottom: pxToRem(20px);
             font-size: pxToRem(24px);
             line-height: pxToRem(36px);
-            display: flex;
-            flex-wrap: wrap;
+            @include flexbox((
+                display: flex,
+                flex-wrap: wrap,
+                justify-content: space-around
+            ));
             &.table {
                 width: 100%;
                 .column {
@@ -43,9 +46,11 @@ $basicBtnC:#eb0313;
                     border-right: pxToRem(4px) solid #fff;
                     font-size: pxToRem(24px);
                     background-color: $tableCellC;
-                    display: flex;
-                    align-items: center;
-                    flex-basis: 49.9%;
+                    @include flexbox((
+                        display: flex,
+                        align-items: center,
+                        flex-basis: 49.9%
+                    ))
                 }
             }
         }