opencharts/charts/pie/pie.css

html,
body {
  width: 100%;
  height: 100%;
}
body {
  margin: 0;
  text-align: center;
}
.pie-chart {
  position: absolute;
  width: 50vh;
  height: 50vh;
  left: 25vh;
  top: 25vh;
}
.wrapper {
  position: relative;
  width: 100%;
  height: 100%;
}
.pie-part {
  width: 100%;
  height: 50%;
  position: absolute;
}
.pie-part .part-inner {
  position: absolute;
  width: 100%;
  height: 100%;
  left: 0;
  top: 0;
  background-color: #008000;
  border-top-right-radius: 50% 100%;
  border-top-left-radius: 50% 100%;
  -webkit-transform-origin: 50% 100%;
  -moz-transform-origin: 50% 100%;
  -ms-transform-origin: 50% 100%;
  -o-transform-origin: 50% 100%;
  transform-origin: 50% 100%;
}
clipper,
.part-4 {
  overflow: hidden;
  position: absolute;
  left: 0;
  top: 50%;
  width: 100%;
  height: 50%;
}
clipper-inner,
.part-4 .part-inner {
  left: 0;
  top: -100%;
}
.part-1 .part-inner {
  background-color: #c832ff;
  -webkit-transform: rotate(0deg);
  -moz-transform: rotate(0deg);
  -ms-transform: rotate(0deg);
  -o-transform: rotate(0deg);
  transform: rotate(0deg);
  z-index: 1;
}
.part-2 .part-inner {
  background-color: #9664ff;
  -webkit-transform: rotate(120deg);
  -moz-transform: rotate(120deg);
  -ms-transform: rotate(120deg);
  -o-transform: rotate(120deg);
  transform: rotate(120deg);
  z-index: 2;
}
.part-3 .part-inner {
  background-color: #6496ff;
  -webkit-transform: rotate(150deg);
  -moz-transform: rotate(150deg);
  -ms-transform: rotate(150deg);
  -o-transform: rotate(150deg);
  transform: rotate(150deg);
  z-index: 3;
}
.part-4 .part-inner {
  background-color: #32c8ff;
  -webkit-transform: rotate(220deg);
  -moz-transform: rotate(220deg);
  -ms-transform: rotate(220deg);
  -o-transform: rotate(220deg);
  transform: rotate(220deg);
  z-index: 4;
}