修改ifr标签的背景颜色

web/public/static/js/main_2020_show.js

@@ -16178,6 +16178,8 @@ window.Modernizr = function(n, e, t) {
                     myElement.style.position = 'absolute';
                     myElement.style.width = myElement.style.height = "100%";
                     myElement.style.left = myElement.style.top = '0';
+                    myElement.style["background-color"] = "rgba(0, 0, 0, 0.4)"; 
+
                      
                     myElement.src = src