move no user select code to a mixin

src/lib/mixins.scss

@@ -0,0 +1,6 @@
+@mixin no_sel {
+    user-select: none;
+    -webkit-user-select: none;
+    -moz-user-select: none;
+    -ms-user-select: none;
+}

src/widget/Titlebar/style.module.scss

@@ -1,4 +1,6 @@
-$corners: 10px;
+@use '../../lib/mixins.scss';
+
+$corners: 16px;
 
 .titlebar {
 
@@ -7,10 +9,7 @@ $corners: 10px;
     z-index: 1;
     width: 100%;
 
-    user-select: none;
+    @include mixins.no_sel;
-    -webkit-user-select: none;
-    -moz-user-select: none;
-    -ms-user-select: none;
 
     background: #111111;
     height: 32px;
@@ -19,7 +18,7 @@ $corners: 10px;
     table {
         border-collapse: collapse;
         height: 33px;
-        transform: translateY(-1px);
+        transform: translate(1px, -1px);
     }
     
     .shade {