update css

static/js/annotation.js

@@ -4,7 +4,12 @@ oml.ui.annotation = function(data, $iframe) {
     var that = Ox.Element().attr({
         id: 'a-' + data.id
     }).css({
-        padding: '16px'
+        backgroundColor: 'white',
+        color: 'black',
+        fontFamily: 'serif',
+        fontSize: '16px',
+        lineHeight: '22px',
+        padding: '8px'
     }).html(data.text).on({
         click: function(event) {
             $iframe.postMessage('selectAnnotation', {