https://blog.faceutil.com/2017/03/29/%ed%99%94%ec%83%81%ed%82%a4%eb%b3%b4%eb%93%9c-%ed%94%84%eb%a1%9c%ea%b7%b8%eb%9e%a8-hot-virtual-keyboard-%ed%84%b0%ec%b9%98%ec%8a%a4%ed%81%ac%eb%a6%b0-pc%ec%97%90-%ec%a0%81%ed%95%a9-%e2%85%a4/