update

src/_sass/gtk/_common-4.0.scss

@@ -3660,16 +3660,13 @@ window.messagedialog {
       @extend %button-flat;
       border: none;
       box-shadow: none;
-
-      &, &:first-child, &:last-child { border-radius: $circular-radius; }
+      border-radius: $circular-radius;
 
       &:not(:last-child) { margin-right: $space-size; }
 
-      &:last-child:not(:disabled) { color: $primary; }
-
-      &.suggested-action:not(:disabled) { color: $suggested; }
+      &.suggested:not(:disabled) { color: $suggested; }
 
-      &.destructive-action:not(:disabled) { color: $destructive; }
+      &.destructive:not(:disabled) { color: $destructive; }
     }
 
     separator {

src/gtk/4.0/gtk-Compact.css

@@ -3988,9 +3988,6 @@ window.messagedialog .response-area {
 window.messagedialog .response-area button {
   border: none;
   box-shadow: none;
-}
-
-window.messagedialog .response-area button, window.messagedialog .response-area button:first-child, window.messagedialog .response-area button:last-child {
   border-radius: 9999px;
 }
 
@@ -3998,15 +3995,11 @@ window.messagedialog .response-area button:not(:last-child) {
   margin-right: 4px;
 }
 
-window.messagedialog .response-area button:last-child:not(:disabled) {
-  color: #1A73E8;
-}
-
-window.messagedialog .response-area button.suggested-action:not(:disabled) {
+window.messagedialog .response-area button.suggested:not(:disabled) {
   color: #1A73E8;
 }
 
-window.messagedialog .response-area button.destructive-action:not(:disabled) {
+window.messagedialog .response-area button.destructive:not(:disabled) {
   color: #D93025;
 }
 

src/gtk/4.0/gtk-Dark-Compact.css

@@ -3988,9 +3988,6 @@ window.messagedialog .response-area {
 window.messagedialog .response-area button {
   border: none;
   box-shadow: none;
-}
-
-window.messagedialog .response-area button, window.messagedialog .response-area button:first-child, window.messagedialog .response-area button:last-child {
   border-radius: 9999px;
 }
 
@@ -3998,15 +3995,11 @@ window.messagedialog .response-area button:not(:last-child) {
   margin-right: 4px;
 }
 
-window.messagedialog .response-area button:last-child:not(:disabled) {
-  color: #3281EA;
-}
-
-window.messagedialog .response-area button.suggested-action:not(:disabled) {
+window.messagedialog .response-area button.suggested:not(:disabled) {
   color: #3281EA;
 }
 
-window.messagedialog .response-area button.destructive-action:not(:disabled) {
+window.messagedialog .response-area button.destructive:not(:disabled) {
   color: #F28B82;
 }
 

src/gtk/4.0/gtk-Dark.css

@@ -3988,9 +3988,6 @@ window.messagedialog .response-area {
 window.messagedialog .response-area button {
   border: none;
   box-shadow: none;
-}
-
-window.messagedialog .response-area button, window.messagedialog .response-area button:first-child, window.messagedialog .response-area button:last-child {
   border-radius: 9999px;
 }
 
@@ -3998,15 +3995,11 @@ window.messagedialog .response-area button:not(:last-child) {
   margin-right: 6px;
 }
 
-window.messagedialog .response-area button:last-child:not(:disabled) {
-  color: #3281EA;
-}
-
-window.messagedialog .response-area button.suggested-action:not(:disabled) {
+window.messagedialog .response-area button.suggested:not(:disabled) {
   color: #3281EA;
 }
 
-window.messagedialog .response-area button.destructive-action:not(:disabled) {
+window.messagedialog .response-area button.destructive:not(:disabled) {
   color: #F28B82;
 }
 

src/gtk/4.0/gtk-Light-Compact.css

@@ -3988,9 +3988,6 @@ window.messagedialog .response-area {
 window.messagedialog .response-area button {
   border: none;
   box-shadow: none;
-}
-
-window.messagedialog .response-area button, window.messagedialog .response-area button:first-child, window.messagedialog .response-area button:last-child {
   border-radius: 9999px;
 }
 
@@ -3998,15 +3995,11 @@ window.messagedialog .response-area button:not(:last-child) {
   margin-right: 4px;
 }
 
-window.messagedialog .response-area button:last-child:not(:disabled) {
-  color: #1A73E8;
-}
-
-window.messagedialog .response-area button.suggested-action:not(:disabled) {
+window.messagedialog .response-area button.suggested:not(:disabled) {
   color: #1A73E8;
 }
 
-window.messagedialog .response-area button.destructive-action:not(:disabled) {
+window.messagedialog .response-area button.destructive:not(:disabled) {
   color: #D93025;
 }
 

src/gtk/4.0/gtk-Light.css

@@ -3988,9 +3988,6 @@ window.messagedialog .response-area {
 window.messagedialog .response-area button {
   border: none;
   box-shadow: none;
-}
-
-window.messagedialog .response-area button, window.messagedialog .response-area button:first-child, window.messagedialog .response-area button:last-child {
   border-radius: 9999px;
 }
 
@@ -3998,15 +3995,11 @@ window.messagedialog .response-area button:not(:last-child) {
   margin-right: 6px;
 }
 
-window.messagedialog .response-area button:last-child:not(:disabled) {
-  color: #1A73E8;
-}
-
-window.messagedialog .response-area button.suggested-action:not(:disabled) {
+window.messagedialog .response-area button.suggested:not(:disabled) {
   color: #1A73E8;
 }
 
-window.messagedialog .response-area button.destructive-action:not(:disabled) {
+window.messagedialog .response-area button.destructive:not(:disabled) {
   color: #D93025;
 }
 

src/gtk/4.0/gtk.css

@@ -3988,9 +3988,6 @@ window.messagedialog .response-area {
 window.messagedialog .response-area button {
   border: none;
   box-shadow: none;
-}
-
-window.messagedialog .response-area button, window.messagedialog .response-area button:first-child, window.messagedialog .response-area button:last-child {
   border-radius: 9999px;
 }
 
@@ -3998,15 +3995,11 @@ window.messagedialog .response-area button:not(:last-child) {
   margin-right: 6px;
 }
 
-window.messagedialog .response-area button:last-child:not(:disabled) {
-  color: #1A73E8;
-}
-
-window.messagedialog .response-area button.suggested-action:not(:disabled) {
+window.messagedialog .response-area button.suggested:not(:disabled) {
   color: #1A73E8;
 }
 
-window.messagedialog .response-area button.destructive-action:not(:disabled) {
+window.messagedialog .response-area button.destructive:not(:disabled) {
   color: #D93025;
 }