Merge pull request #889 from BeatC/tooltips-bg

Change color for tooltip

css/_base.scss

     display: -ms-flexbox !important;
     display: -webkit-flex !important;
     display: flex !important;
+}
+
+.tipsy {
+    &-inner {
+        background-color: $tooltipBg;
+    }
+
+    &-arrow {
+        border-color: $tooltipBg;
+    }
 }

css/_variables.scss

 $defaultSemiDarkColor: #ACACAC;
 $defaultDarkColor: #4F4F4F;
 $defaultBackground: #474747;
+$tooltipBg: rgba(0,0,0, 0.7);
 
 // Toolbar
 $toolbarSelectBackground: rgba(0, 0, 0, .6);