.qr-wrap{max-width:700px;margin:20px auto;padding:20px;border:1px solid #ddd;font-family:Arial}.qr-wrap input{width:100%;padding:10px}.btns{margin:15px 0}.btns button{padding:10px 15px;margin-right:8px}.preview{text-align:center}.preview img{max-width:300px}