fix: small screen error msg covered code button (vuejs#18)

Author: wxsms

.gitignore

@@ -1,4 +1,7 @@
 node_modules
 .DS_Store
 dist
-TODOs.md
+TODOs.md
+
+# jetbrains files
+.idea

src/Message.vue

@@ -80,11 +80,15 @@ pre {
   color: #fff;
 }
 
-@media (max-width: 760px) {
+@media (max-width: 720px) {
   .dismiss {
     top: -9px;
     right: -9px;
   }
+
+  .msg {
+    bottom: 50px;
+  }
 }
 
 .msg.err {