DevTools: [MQI] text-shadow for label instead of black background color

Source/devtools/front_end/responsiveDesignView.css

Index: Source/devtools/front_end/responsiveDesignView.css
diff --git a/Source/devtools/front_end/responsiveDesignView.css b/Source/devtools/front_end/responsiveDesignView.css
index 54131b661d76171aca9c0a6dad2e5d1fe72ee0ae..2831434bb1a4869bcfe606c5191fa7b52f73723c 100644
--- a/Source/devtools/front_end/responsiveDesignView.css
+++ b/Source/devtools/front_end/responsiveDesignView.css
@@ -480,14 +480,10 @@ body.platform-mac .responsive-design-toolbar select {
 }
 
 .media-inspector-max-label {
-    background-color: rgba(0, 0, 0, 0.5);
+    text-shadow: 0px 0px 2px black;
     padding-left: 11px;
 }
 
-.media-inspector-marker-container:hover .media-inspector-max-label {
-    background-color: rgba(0, 0, 0, 0.3);
-}
-
 .media-inspector-max-label::before {
     position: absolute;
     padding-right: 2px;