#calendar{ padding-top: 5px; }
text.month-name,
text.calendar-heatmap-legend-text,
text.day-initial {
  font-size: 10px;
  fill: #aaaaaa;
  font-family: Helvetica, arial, 'Open Sans', sans-serif
}
.day-cell {
  border: 1px solid gray;
}
rect.day-cell:hover {
  stroke: #555555;
  stroke-width: 1px;
}
#calendar_tt { font-size: 11px; text-align: center; height: 10px; margin-top: -20px; margin-bottom: 20px; }
#calendar_tt > span { font-family: Helvetica, arial, 'Open Sans', sans-serif }