GUAC-1120: Use flex layout for headers containing the user menu.

guacamole/src/main/webapp/app/userMenu/styles/user-menu.css

@@ -20,14 +20,42 @@
  * THE SOFTWARE.
  */
 
-.user-menu {
-    float: right;
+.user-menu .user-menu-dropdown {
+
     position: relative;
+    border-left: 1px solid rgba(0,0,0,0.125);
+    background: rgba(0,0,0,0.04);
+
+    /* IE10 */
+    display: -ms-flexbox;
+    -ms-flex-align: center;
+    -ms-flex-direction: row;
+
+    /* Ancient Mozilla */
+    display: -moz-box;
+    -moz-box-align: center;
+    -moz-box-orient: horizontal;
+    
+    /* Ancient WebKit */
+    display: -webkit-box;
+    -webkit-box-align: center;
+    -webkit-box-orient: horizontal;
+
+    /* Old WebKit */
+    display: -webkit-flex;
+    -webkit-align-items: center;
+    -webkit-flex-direction: row;
+
+    /* W3C */
+    display: flex;
+    align-items: center;
+    flex-direction: row;
+
+    z-index: 5;
+    
 }
 
-.user-menu a.username {
-
-    display: block;
+.user-menu .username {
 
     margin: 0;
     min-width: 1.75in;
@@ -35,8 +63,6 @@
     font-size: 1.25em;
     font-weight: bold;
     padding: .75em .5em;
-    border-left: 1px solid rgba(0,0,0,0.125);
-    background: rgba(0,0,0,0.04);
 
     padding-left: 2em;
     background-repeat: no-repeat;
@@ -44,21 +70,27 @@
     background-position: 0.5em 0.75em;
     background-image: url('images/user-icons/guac-user.png');
 
+    -ms-flex: 0 0 auto;
+    -moz-box-flex: 0;
+    -webkit-box-flex: 0;
+    -webkit-flex: 0 0 auto;
+    flex: 0 0 auto;
+   
 }
 
 .user-menu .options {
 
     position: absolute;
+    top: 100%;
     right: 0;
+    left: -1px;
     margin: 0;
     padding: 0;
-    min-width: 100%;
 
     background: #EEE;
     box-shadow: 0 2px 2px rgba(0, 0, 0, 0.125);
     border-left: 1px solid rgba(0,0,0,0.125);
     border-bottom: 1px solid rgba(0,0,0,0.125);
-    z-index: 0;
 
 }
 
@@ -121,7 +153,7 @@
     margin: 1em;
     right: 0;
     top: 0;
-    z-index: 1;
+    z-index: 8;
 }
 
 .user-menu .password-dialog.shown {