chore: style lint cleanup

ui/core/.sasslintrc

@@ -0,0 +1,7 @@
+files:
+  include: 'app/styles/**/*.s+(a|c)ss'
+rules:
+  leading-zero: 0
+  mixins-before-declarations: 0
+  nesting-depth: 0
+  placeholder-in-extend: 0

ui/core/app/styles/app.scss

@@ -95,7 +95,7 @@
 
 .copyable {
   white-space: nowrap;
-  
+
   .copyable-button {
     margin: 0;
     padding: 0 sizing.rems(xxs);
@@ -104,9 +104,10 @@
   }
 
   mark {
-    color: inherit;
-    background-color: transparent;
     animation: fadeBackground 0.75s linear;
+    background-color: transparent;
+    color: inherit;
+
     @keyframes fadeBackground {
       0%   { background-color: var(--action-subtler-1); }
       100% { background-color: transparent; }