feat(scss): More idiomatic writing

src/shared/static/bulma/bulma.scss

@@ -35,19 +35,19 @@ body {
 
 .bt-links {
   justify-content: space-evenly;
-}
 
-.bt-links > .button {
-  width: 47.5%;
+  .button {
+    width: 47.5%;
+  }
 }
 
 .grid.groups {
   --bulma-grid-column-min: min(24rem, 100%);
-}
 
-.groups > .button > span {
-  overflow-x: hidden;
-  text-overflow: ellipsis;
+  .button > span {
+    overflow-x: hidden;
+    text-overflow: ellipsis;
+  }
 }
 
 #notifications {
@@ -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%;
+  }
 }