.box{
  width: 74px;
  height: 74px;
  box-sizing: border-box;
  border-style: solid;
  border-width: 37px 0px 37px 74px;
  border-color: transparent transparent transparent steelblue;
  transition: all 100ms ease-in-out;
}

.pause{
  border-style: double;
  border-width:0px 0px 0px 60px;
}