title: Android studio Button color not changing - Kotlin
body: <p>Here are my pics,
  <a href="https://i.stack.imgur.com/ZyRX7.jpg" rel="nofollow noreferrer">It is the code in which i have written the color code</a></p>
  <p><a href="https://i.stack.imgur.com/dLbKn.png" rel="nofollow noreferrer">Here is android blueprint here the color doesn't change</a></p>
  <p>I have tried many ways like adding through styles too it didn't work out.
  I have also tried to change background tint but it doesn't help either.
  how can i change the button color?<br />
  i have shared my code in pics above.<br />
  Help me to change color</p>