.proof--semi-circle .picker{transform:rotate(-90deg)}.proof--semi-circle .picker:before{border-top:1px dashed green;content:" ";display:block;height:0;left:0;position:absolute;top:15px;width:100%}.proof--semi-circle #pickerA{border:1px solid green}.proof--semi-circle .diameter{border-bottom:1px solid #000;margin-top:-1px;position:absolute;top:50%;width:100%}.proof--semi-circle .pointA,.proof--semi-circle .pointC,.proof--semi-circle .pointO{font-size:20px;left:-30px;margin-top:-10px;position:absolute;top:50%}.proof--semi-circle .pointO{left:50%;margin-left:-8px;margin-top:0}.proof--semi-circle .pointC{left:auto;right:-30px}.proof--semi-circle .pointB{left:100%;margin-left:20px;position:absolute;top:6px;transform:rotate(90deg)}