feat(scss): More idiomatic writing

src/shared/static/bulma/bulma.scss

@@ -35,20 +35,20 @@ body {
 
 .bt-links {
   justify-content: space-evenly;
-}
 
-.bt-links > .button {
+  .button {
     width: 47.5%;
   }
+}
 
 .grid.groups {
   --bulma-grid-column-min: min(24rem, 100%);
-}
 
-.groups > .button > span {
+  .button > span {
     overflow-x: hidden;
     text-overflow: ellipsis;
   }
+}
 
 #notifications {
   margin-left: -0.75rem;
@@ -63,8 +63,11 @@ body {
   margin-bottom: var(--bulma-block-spacing);
 }
 
-.dropdown.is-fullwidth,
-.dropdown.is-fullwidth > .dropdown-trigger,
-.dropdown.is-fullwidth > .dropdown-menu {
+.dropdown.is-fullwidth {
+  width: 100%;
+
+  .dropdown-trigger,
+  .dropdown-menu {
     width: 100%;
   }
+}