:root{--sandbox-bg: #fff}*{box-sizing:border-box}html,body,#app{width:100%;height:100%;margin:0;overflow:hidden;font-family:PingFang SC,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--sandbox-bg)}.sandbox-root{display:flex;flex-direction:column;width:100%;height:100%}.sandbox-stage{position:relative;flex:1;min-height:0;background:var(--sandbox-bg)}.sandbox-iframe{width:100%;height:100%;border:0;background:var(--sandbox-bg)}