When I start my Compose application the colors are tale and it does not look right

Question

When I build my Jetpack Compose application for my Desktop it is tale and looks like this:

I expected it to look like the example Application from the wizard.

Code (Exactly like on The Wizzard):

import androidx.compose.animation.AnimatedVisibility
import androidx.compose.foundation.Image
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.material.Button
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Text
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import org.jetbrains.compose.resources.ExperimentalResourceApi
import org.jetbrains.compose.resources.painterResource
import org.jetbrains.compose.ui.tooling.preview.Preview

import yousic.composeapp.generated.resources.Res
import yousic.composeapp.generated.resources.compose_multiplatform

@OptIn(ExperimentalResourceApi::class)
@Composable
@Preview
fun App() {
    MaterialTheme {
        var showContent by remember { mutableStateOf(false) }
        Column(Modifier.fillMaxWidth(), horizontalAlignment = Alignment.CenterHorizontally) {
            Button(onClick = { showContent = !showContent }) {
                Text("Click me!")
            }
            AnimatedVisibility(showContent) {
                val greeting = remember { Greeting().greet() }
                Column(Modifier.fillMaxWidth(), horizontalAlignment = Alignment.CenterHorizontally) {
                    Image(painterResource(Res.drawable.compose_multiplatform), null)
                    Text("Compose: $greeting")
                }
            }
        }
    }
}