html,body{ height: 100%; margin: 0; padding: 0;}
.pc-wrap{display: none;}
.pc-wrap{ width: 100%; height: 100%; background-color: rgba(0,0,0,0.8); position: relative;}
.pc-wrap .pc-center{ position: absolute; left: 50%; top: 50%; transform: translate(-50%,-50%);}
.pc-wrap .pc-center .pc-code{ width: 300px; height: 300px; background-color: #000; margin: auto; border: 10px solid #fff;}
.pc-wrap .pc-center p{ text-align: center; margin-top: 50px; color: #fff;font-weight:bold}
.pc-code img{ width: 100%;}