style improvements to details button

css/app.css

@@ -451,12 +451,11 @@ button.Browse .label {
 }
 
 .inspector-toggle {
-    padding:10px;
-    text-shadow: 0 -1px 0 rgba(0,0,0,0.25);
-    text-align:center;
     color:#fff;
-    cursor:pointer;
+    width: 100%;
+    display: block;
     background:#7092ff;
+    border: 0;
 }
 
 .inspector-body {

js/id/ui/inspector.js

@@ -198,19 +198,20 @@ iD.Inspector = function() {
             inspectorbody.style('display', 'none')
                 .style('margin-top', (-inHeight) + 'px');
 
-            var inspectortoggle = selection.append('div')
-                .attr('class', 'inspector-toggle')
-                .text('Details')
+            var inspectortoggle = selection.append('button')
+                .attr('class', 'inspector-toggle action')
                 .on('click', function() {
                     inspectortoggle.style('display', 'none');
                     inspectorbody
                         .style('display', 'block')
                         .transition()
                         .style('margin-top', '0px');
-                });
-
+                })
             formsel.select('input').node().focus();
 
+            inspectortoggle.append('span')
+                .text('Details')
+                .attr('class','label');
         });
     }