little fixes for ie 7

lib/forms.less

@@ -140,7 +140,7 @@ textarea {
 }
 input:focus,
 textarea:focus {
-  outline: none;
+  outline: 0;
   border-color: rgba(82,168,236,.8);
   @shadow: inset 0 1px 3px rgba(0,0,0,.1), 0 0 8px rgba(82,168,236,.6);
   .box-shadow(@shadow);
@@ -331,6 +331,8 @@ textarea[readonly] {
   }
   .add-on {
     position: relative;
+    background: #f5f5f5;
+    border: 1px solid #ccc;
     z-index: 2;
     float: left;
     display: block;
@@ -344,8 +346,6 @@ textarea[readonly] {
     color: @grayLight;
     text-align: center;
     text-shadow: 0 1px 0 @white;
-    background-color: #f5f5f5;
-    border: 1px solid #ccc;
     .border-radius(3px 0 0 3px);
   }
   .active {