Change Chromium button border color to a solid variant to fix window transparency

src/_sass/gtk/apps/_misc.scss

@@ -76,7 +76,7 @@ window.background.chromium {
   // toolbar's border-bottom refers to button's border
   // FIXME: Chrome's button border ignores theme's alpha value :(
   entry,
-  > button { border: 1px solid $track; }
+  > button { border: 1px solid $titlebar-backdrop; }
 
   > button {
     color: $primary;

src/gtk/3.0/gtk-Compact.css

@@ -7115,7 +7115,7 @@ window.background.chromium {
 
 window.background.chromium entry,
 window.background.chromium > button {
-  border: 1px solid rgba(0, 0, 0, 0.26);
+  border: 1px solid #2C2C2C;
 }
 
 window.background.chromium > button {

src/gtk/3.0/gtk-Dark-Compact.css

@@ -7111,7 +7111,7 @@ window.background.chromium {
 
 window.background.chromium entry,
 window.background.chromium > button {
-  border: 1px solid rgba(255, 255, 255, 0.3);
+  border: 1px solid #2C2C2C;
 }
 
 window.background.chromium > button {

src/gtk/3.0/gtk-Dark.css

@@ -7111,7 +7111,7 @@ window.background.chromium {
 
 window.background.chromium entry,
 window.background.chromium > button {
-  border: 1px solid rgba(255, 255, 255, 0.3);
+  border: 1px solid #2C2C2C;
 }
 
 window.background.chromium > button {

src/gtk/3.0/gtk-Light-Compact.css

@@ -7114,7 +7114,7 @@ window.background.chromium {
 
 window.background.chromium entry,
 window.background.chromium > button {
-  border: 1px solid rgba(0, 0, 0, 0.26);
+  border: 1px solid #FFFFFF;
 }
 
 window.background.chromium > button {

src/gtk/3.0/gtk-Light.css

@@ -7114,7 +7114,7 @@ window.background.chromium {
 
 window.background.chromium entry,
 window.background.chromium > button {
-  border: 1px solid rgba(0, 0, 0, 0.26);
+  border: 1px solid #FFFFFF;
 }
 
 window.background.chromium > button {

src/gtk/3.0/gtk.css

@@ -7115,7 +7115,7 @@ window.background.chromium {
 
 window.background.chromium entry,
 window.background.chromium > button {
-  border: 1px solid rgba(0, 0, 0, 0.26);
+  border: 1px solid #2C2C2C;
 }
 
 window.background.chromium > button {