#stage,canvas{display:block;top:0;left:0;height:100%;overflow:hidden;font-family:Arial,Helvetica,sans-serif;color:#fff;box-sizing:border-box}#signum,#stage,canvas{position:absolute;width:100%}#signum{top:50%;left:50%;height:auto;transform:translate(-50%,-50%);object-fit:contain}.param>:not(button){flex-grow:1}.param input+span{margin-left:5px}button{cursor:pointer}