title: Can´t put the background in white on jetpack compose
body: <p>I'm making a Login page on Jetpack compose. I'm using themes with MaterialTheme. When I choose the background colour as white, it shows me a dark grey colour. I can use all other colours, but if I use white, it is not working.</p>
  <p>Here´s the code:</p>
  <pre><code>@Composable
  fun LoginScreen() {
      ReportAppTheme(darkTheme = false){
          Column(
              modifier = Modifier
                  .fillMaxSize()
                  .background(color = MaterialTheme.colors.background),
              horizontalAlignment = Alignment.CenterHorizontally,
              verticalArrangement = Arrangement.SpaceAround
  
          ){}
  </code></pre>
  <p>And this is my theme.kt</p>
  <pre><code>private val LightColorPalette = lightColors(
      primary = Main3,
      primaryVariant = Main1,
      onPrimary = white,
      secondary = Teal200,
      secondaryVariant = Teal_600,
      onSecondary = black,
      error = red_dark,
      background = white ,
      onError = red_light,
      onBackground = black,
      surface = white,
      onSurface = black
  )
  
  
  @Composable
  fun ReportAppTheme(
      darkTheme: Boolean,
      content: @Composable () -&gt; Unit,
  ) {
      MaterialTheme(
          colors = if(darkTheme) DarkColorPalette
          else LightColorPalette
      ) {
          content()
      }
  }
  </code></pre>