.github-chart .nv-bar{
  fill-opacity:1;
}
.github-chart .nvtooltip {
  background-color: #fff;
  border: 1px solid rgba(0, 0, 0, 0.2);
  z-index: 10000;
  font-family: Arial;
  font-size: 13px;
  -moz-box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
  -webkit-box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
  -webkit-border-radius: 6px;
  -moz-border-radius: 6px;
  border-radius: 6px;
  pointer-events: none;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.github-chart .nvtooltip.x-nvtooltip,
.github-chart .nvtooltip.y-nvtooltip {
  padding: 8px;
}

.github-chart .nvtooltip h3 {
  margin: 0;
  padding: 4px 14px;
  line-height: 18px;
  font-weight: normal;
  font-size: 13px;
  background-color: rgba(247, 247, 247, 0.75);
  text-align: center;
  border-bottom: 0 solid #ebebeb;
  color:#000;
  font-family: Arial, serif;
	text-shadow: none;
  -webkit-border-radius: 5px 5px 0 0;
  -moz-border-radius: 5px 5px 0 0;
  border-radius: 5px 5px 0 0;
}

.github-chart .nvtooltip p {
  margin: 0;
  padding: 5px 14px;
  text-align: center;
}

.github-chart .nvtooltip span {
  display: inline-block;
  margin: 2px 0;
}