.chart1 {
  position: relative;
  display: inline-block;
  width: 110px;
  height: 110px;
  margin-top: 50px;
  margin-bottom: 50px;
  text-align: center;
}
.chart1 canvas {
  position: absolute;
  top: 0;
  left: 0;
}

.chart2 {
  position: relative;
  display: inline-block;
  width: 110px;
  height: 110px;
  margin-top: 50px;
  margin-bottom: 50px;
  text-align: center;
}
.chart2 canvas {
  position: absolute;
  top: 0;
  left: 0;
}

.chart3 {
  position: relative;
  display: inline-block;
  width: 110px;
  height: 110px;
  margin-top: 50px;
  margin-bottom: 50px;
  text-align: center;
}
.chart3 canvas {
  position: absolute;
  top: 0;
  left: 0;
}

.chart4 {
  position: relative;
  display: inline-block;
  width: 110px;
  height: 110px;
  margin-top: 50px;
  margin-bottom: 50px;
  text-align: center;
}
.chart4 canvas {
  position: absolute;
  top: 0;
  left: 0;
}

.percent {
  display: inline-block;
  line-height: 110px;
  z-index: 2;
}
.percent:after {
  content: '%';
  margin-left: 0.1em;
  font-size: .8em;
}