diff --git a/core/.stylelintrc.json b/core/.stylelintrc.json
index 832748d..e3a52b0 100644
--- a/core/.stylelintrc.json
+++ b/core/.stylelintrc.json
@@ -16,7 +16,6 @@
     "declaration-colon-space-after": null,
     "function-comma-space-after": null,
     "function-linear-gradient-no-nonstandard-direction": null,
-    "function-name-case": null,
     "function-whitespace-after": null,
     "length-zero-no-unit": null,
     "no-empty-source": null,
diff --git a/core/themes/seven/css/components/jquery.ui/theme.css b/core/themes/seven/css/components/jquery.ui/theme.css
index dd81ec2..63d23ef 100644
--- a/core/themes/seven/css/components/jquery.ui/theme.css
+++ b/core/themes/seven/css/components/jquery.ui/theme.css
@@ -43,12 +43,12 @@
 .ui-state-disabled,
 .ui-widget-content .ui-state-disabled {
   opacity: .35;
-  filter: Alpha(Opacity=35);
+  filter: alpha(Opacity=35);
 }
 .ui-priority-secondary,
 .ui-widget-content .ui-priority-secondary {
   opacity: .7;
-  filter: Alpha(Opacity=70);
+  filter: alpha(Opacity=70);
 }
 
 /**
@@ -332,7 +332,7 @@
 .ui-widget-overlay {
   background: #000;
   opacity: .70;
-  filter: Alpha(Opacity=70);
+  filter: alpha(Opacity=70);
 }
 
 /**