Add danger button style to flat theme

install/deb/themes/flat.css

@@ -100,6 +100,18 @@ b, strong {
     background: linear-gradient(to bottom, rgba(210,232,250,1) 0%,rgba(194,224,248,1) 100%) !important;
 }
 
+.ui-button.danger:hover, .button.danger:hover {
+    background: #f1968b !important;
+    color: #F4301A !important;
+    border: 1px solid #F27E71 !important;
+}
+  
+.ui-button.danger:active, .button.danger:active, .ui-button.danger:focus, .button.danger:focus {
+    background: #a91200 !important; 
+    color: #fff !important;
+    border: 1px solid #F4301A !important;
+}
+
 .alert {
     text-shadow: none !important;
     box-shadow: none !important;