Create universal solution for success icon vertically middle and other icon along with it

Author: speedy008

app/design/adminhtml/Magento/backend/web/css/source/components/_messages.less

@@ -76,7 +76,8 @@
         position: absolute;
         speak: none;
         text-shadow: none;
-        top: 1.5rem;
+        top: 50%;
+        margin-top: -1.25rem;
         width: auto;
     }
 }
@@ -121,17 +122,6 @@
     }
 }
 
-.adminhtml-import-index {
-    .message-success {
-        &:before {
-            color: @alert-icon__success__color;
-            content: @alert-icon__success__content;
-            top: 2.3rem;
-        }
-    }
-} 
-
-
 .message-spinner {
     &:before {
         display: none;