fix lint error

src/css/page-versions.css

@@ -40,16 +40,15 @@
   background: url(../img/chevron.svg) no-repeat;
   background-position: right 0.5rem top 50%;
   background-size: auto 0.75em;
-  border: none;
   outline: none;
   line-height: inherit;
   padding: 0.5rem 2rem 0.5rem 1rem;
   position: relative;
   border-radius: 0.5rem;
   border: 2px solid var(--color-smoke-90);
-  transition: all .15s ease-in-out;
+  transition: all 0.15s ease-in-out;
   z-index: var(--z-index-page-version-menu);
-  }
+}
 
 .page-versions .version-menu-toggle:hover {
   border: 2px solid var(--color-bwg-main);
@@ -88,7 +87,6 @@
   background-color: var(--color-blue-10);
 }
 
-
 .page-versions .version.is-current {
   display: none;
 }