2 files changed, 15 insertions, 3 deletions
diff --git a/common/gtk-3.0/3.20/sass/_applications.scss b/common/gtk-3.0/3.20/sass/_applications.scss
index 9697e9d..99c0334 100644
--- a/common/gtk-3.0/3.20/sass/_applications.scss
+++ b/common/gtk-3.0/3.20/sass/_applications.scss
@@ -518,6 +518,13 @@ button.documents-favorite:active:hover {
 }
 
 //
+// Atril (MATE pdf viewer)
+//
+.atril-window .primary-toolbar toolbar {
+  background: none;
+}
+
+//
 // Gnome Flashback
 //
 #gf-bubble,
diff --git a/common/gtk-3.0/3.20/sass/_common.scss b/common/gtk-3.0/3.20/sass/_common.scss
index 9671ae6..8f97699 100644
--- a/common/gtk-3.0/3.20/sass/_common.scss
+++ b/common/gtk-3.0/3.20/sass/_common.scss
@@ -2402,8 +2402,12 @@ frame > border,
   padding: 0;
   border-radius: 0;
   border: 1px solid $borders_color;
+}
 
-  &.flat { border-style: none; }
+frame.flat > border,
+frame > border.flat,
+.frame.flat {
+  border-style: none;
 }
 
 scrolledwindow {
@@ -3027,8 +3031,9 @@ colorchooser .popover.osd { border-radius: 3px; }
 button.circular,
 button.circular-button {
   padding: 0;
-  min-width: 26px;
-  min-height: 26px;
+  min-width: 16px;
+  min-height: 24px;
+  padding: 2px 6px;
   border-radius: 50%;
   -gtk-outline-radius: 50%;