diff --git a/tests/interactive/inline-style.js b/tests/interactive/inline-style.js
index fa23b1f70..e06082cab 100644
--- a/tests/interactive/inline-style.js
+++ b/tests/interactive/inline-style.js
@@ -27,14 +27,14 @@ update_size();
 
 let button;
 
-button = new St.Button ({ label: 'Smaller' });
+button = new St.Button ({ label: 'Smaller', style_class: 'push-button' });
 hbox.add (button);
 button.connect('clicked', function() {
                    size /= 1.2;
                    update_size ();
                });
 
-button = new St.Button ({ label: 'Bigger' });
+button = new St.Button ({ label: 'Bigger', style_class: 'push-button' });
 hbox.add (button);
 button.connect('clicked', function() {
                    size *= 1.2;
diff --git a/tests/testcommon/test.css b/tests/testcommon/test.css
index 36e1b21fd..d1005eeb3 100644
--- a/tests/testcommon/test.css
+++ b/tests/testcommon/test.css
@@ -37,17 +37,17 @@ stage {
     border-image: url('border-image.png') 16;
 }
 
-StButton {
+.push-button {
     background: #eeddbb;
     border: 1px solid black;
     border-radius: 8px;
     padding: 5px;
 }
 
-StButton:hover {
+.push-button:hover {
     background: #ffeecc;
 }
 
-StButton:active {
+.push-button:active {
     background: #ccbb99;
 }