title: How to change textField underline color?
body: <p>I'm new to both flutter &amp; dart. Currently, using this in one of my personal projects. </p>
  
  <p><a href="https://i.stack.imgur.com/Ycfjq.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Ycfjq.png" alt="enter image description here"></a></p>
  
  <p>In all of my form, the underline of textField is showing in blue color. I want to change that to some other color. The piece of code which I'm using is like...</p>
  
  <pre><code>new TextField(
    controller: this._emailController,
    decoration: new InputDecoration(
        hintText: "Enter your email",
        labelText: "Email",
        labelStyle: new TextStyle(
            color: const Color(0xFF424242)
        )
    ),
  
  ),
  </code></pre>
  
  <p>Can't able to understand how to achieve this.  </p>
  
  <p>Note: I know there is a similar question at here <a href="https://stackoverflow.com/questions/48706884/change-textfields-underline-in-flutter">Change TextField&#39;s Underline in Flutter</a>. But, at there also it has not completely solved. Also, one more link which looks similar to mine at here <a href="https://stackoverflow.com/questions/26574328/changing-edittext-bottom-line-color-with-appcompat-v7">Changing EditText bottom line color with appcompat v7</a> but, that actually belong to Android development by using JAVA not DART(flutter) which I'm using for my android app development. So, please don't get confused about those links.</p>