Minor css improvements

src/css/ingame_hud/buildings_toolbar.scss

@@ -23,6 +23,9 @@
         transform: translateX(-50%) translateY(#{D(100px)});
     }
 
+    @include S(border-top-left-radius, $globalBorderRadius);
+    @include S(border-top-right-radius, $globalBorderRadius);
+
     .buildings {
         display: grid;
         grid-auto-flow: column;

src/css/ingame_hud/interactive_tutorial.scss

@@ -15,6 +15,8 @@
     display: flex;
     flex-direction: column;
 
+    @include S(border-radius, $globalBorderRadius);
+
     @include MakeAnimationWrappedEvenOdd(0.5s ease-in-out) {
         0% {
         }