title: Making Button span across VStack
body: <p>I currently have the following SwiftUI view:</p>
  
  <pre><code>HStack {
    ...
    VStack {
      TextField { ... }
      SecureField { ... }
      Button { ... }
    }
    ...
  }
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/KcwL9.png" rel="noreferrer"><img src="https://i.stack.imgur.com/KcwL9.png" alt="enter image description here"></a></p>
  
  <p>I've added a <code>.background(Color.green)</code> to the <code>Button</code>, and as you can see, the view is very snug to the text.</p>
  
  <p>I'm wondering if there's a way to adjust the width of the button so that it fills across <code>VStack</code> - something like a <code>.fill</code> mode for <code>UIStackView</code>.</p>