Apply grid fixes to new quest form

scss/sections/_sidenav.scss

@@ -2,13 +2,15 @@
   @include grid-pad;
   @include panel-margin;
   width: 100%;
-  display: flex;
-  flex-direction: column;
 
   @include media($large-screen) {
     width: 21rem;
   }
 
+  @include media($xlarge-screen) {
+    width: 30rem;
+  }
+
   .sidenav__link {
     display: block;
     border-top: 1px solid $color-black;
@@ -36,7 +38,7 @@
         background-color: $color-white;
 
         .sidenav__link {
-          &.sidenav__link--active {
+          &--active {
             @include h5;
             box-shadow: none;
           }
@@ -74,6 +76,8 @@
   }
 
   > ul {
+    @include panel-margin;
+
     > li {
       &:last-child {
         > .sidenav__link {