.gauge {
    position: relative;
    border-radius: 50%/100% 100% 0 0;
    background-color: var(--color, #a22);
    overflow: hidden;
}
.gauge:before{
    content: "";
    display: block;
    padding-top: 50%;   /* ratio of 2:1*/
}
.gauge .chart {
  overflow: hidden;
}
.gauge .mask {
  position: absolute;
  left: 20%;
  right: 20%;
  bottom: 0;
  top: 40%;
  background-color: #fff;
  border-radius: 50%/100% 100% 0 0;
}

.gauge .percentage {
    position:  absolute;
    top: -1px;
    left: -1px;
    bottom: 0;
    right: -1px;
    background-color: var(--background, #aaa);
    transform:rotate(var(--rotation)); 
    transform-origin: bottom center; 
    transition-duration: 600;
}
.gauge:hover {
  --rotation: 100deg;
}
.gauge .value {
  position:absolute; bottom:0%; left:0;   
  width:100%; 
  text-align: center;
}

.gauge .min {
  position:absolute; 
  bottom:0; left:5%;   
}
.gauge .max {
  position:absolute; 
  bottom:0; right:5%;   
 }