Update 优化图标

SourceCode/WeApp.Web/Content/Css/ExerciseV2_1/screen.css

@@ -808,6 +808,10 @@ body {
   bottom: 20px;
   right: 20px;
 }
+.stu-question-box .questions-box .question-form .send-btn:disabled {
+  background: #D3D9DF;
+  color: #fff;
+}
 .stu-question-box .questions-box .empty {
   width: 100%;
   height: 300px;

SourceCode/WeApp.Web/Content/Scss/ExerciseV2_1/screen.scss

@@ -785,6 +785,11 @@ body {
                 position: absolute;
                 bottom: 20px;
                 right: 20px;
+
+                &:disabled {
+                    background: #D3D9DF;
+                    color: #fff;
+                }
             }
         }