Fix context menu in drive and rename textbox styling

www/drive/file.less

@@ -95,6 +95,7 @@ li {
 .contextMenu {
     display: none;
     position: absolute;
+    z-index: 50;
     li {
         padding: 0;
         font-size: 16px;
@@ -292,6 +293,7 @@ span {
             }
             input {
                 width: 100%;
+                margin-top: 5px;
             }
             .fa {
                 display: block;