Fixes #2903 - Fix CSS imports so body and html styles are included from .scss files. Update body selector to have a font-family

src/style/_layout.scss

@@ -1,21 +1,3 @@
-html
-{
-    box-sizing: border-box;
-}
-*,
-*:before,
-*:after
-{
-    box-sizing: inherit;
-}
-
-body
-{
-    margin: 0;
-
-    background: #fafafa;
-}
-
 .wrapper
 {
     width: 100%;

src/style/_reset.scss

@@ -0,0 +1,18 @@
+html
+{
+    box-sizing: border-box;
+    overflow: -moz-scrollbars-vertical;
+    overflow-y: scroll;
+}
+*,
+*:before,
+*:after
+{
+    box-sizing: inherit;
+}
+
+body {
+    background: #fafafa;
+    margin:0;
+    @include text_body()
+}

src/style/main.scss

@@ -1,9 +1,11 @@
+@import 'mixins';
+@import 'variables';
+@import 'colors';
+@import 'type';
+@import 'reset';
+
 .swagger-ui
 {
-    @import 'mixins';
-    @import 'variables';
-    @import 'colors';
-    @import 'type';
     @import 'layout';
     @import 'buttons';
     @import 'form';