TopAppBar(backgroundColor = green2) {
    var baseLine by remember { mutableStateOf(0f)}
    val topBaselinePadding = with(LocalDensity.current) { baseLine.toDp() }
    Icon(
        painter = painterResource(id = R.drawable.ic__home),
        contentDescription = "分类",
        modifier = Modifier.padding(start = 6.dp, top = 3.dp, bottom = topBaselinePadding)
    )
    Text(
        text = "Cat facts",
        modifier = Modifier
            .padding(start = 20.dp)
            .paddingFromBaseline(bottom = topBaselinePadding),
        style = TextStyle(fontFamily = FontFamily(Font(R.raw.font1)), fontSize = 48.sp),
        onTextLayout = { baseLine = it.size.height - it.lastBaseline}
    )
}