xcx/测试小程序分包/miniprogram-2/app.wxss

/**app.wxss**/
.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 50rpx 0;
  box-sizing: border-box;
} 
.canvas {
    width: 100%;
    /* height: 200px; */
}