fix progressbar styles when inside an osd. disable psuedo element warnings. darken separator color for titlebuttons.

gtk-3.20/scss/widgets/_osd.scss

@@ -106,14 +106,14 @@
         }
     }
 
-    .osd progressBar, progressBar.osd {
-        -GtkProgressBar-xspacing: 0;
-        -GtkProgressBar-yspacing: 2px;
-        -GtkProgressBar-min-horizontal-bar-height: 2px;
+    .osd progressbar, progressbar.osd {
+        margin: 2px;
+        min-height: 2px;
+        min-width: 2px;
 
         padding: 0;
 
-        &.trough {
+        trough {
             padding: 0;
             border-style: none;
             border-radius: 0;
@@ -121,7 +121,7 @@
             background-color: transparent;
         }
 
-        &.progressbar {
+        progress {
             border-style: none;
             border-radius: 0;
             background-color: $selected_bg_color;

gtk-3.20/scss/widgets/_toolbar.scss

@@ -46,7 +46,7 @@
     &.vertical separator { margin: ($spacing + 2px) 1px ($spacing + 2px) 0; }
 
     separator, separator:disabled {
-        color: shade($bg, ($contrast + .1));
+        color: shade($bg, ($contrast - .2));
         border-color: currentColor;
 
         -GtkWidget-window-dragging: true;