'How do I decrease the border width of the text form field?

I need to reduce the width of my border side in TextField. How can I do that?

final emailNameField = TextFormField(
      autofocus: false,
      controller: emailEditingController,
      keyboardType: TextInputType.emailAddress,
      validator: (email) => email != null && !EmailValidator.validate(email)
          ? "Enter a valid Email"
          : null,
      onSaved: (email) {
        emailEditingController.text = '$email';
      },
      textInputAction: TextInputAction.next,
      decoration: const InputDecoration(
          prefixIcon: Icon(Icons.mail),
          contentPadding: EdgeInsets.fromLTRB(20, 15, 20, 15),
          prefixIconColor: Colors.red,
          border: OutlineInputBorder(
              borderRadius: BorderRadius.only(),
              borderSide: BorderSide(width: 1)),
          hintText: 'Email '),
    );

    //password field
    final passwordNameField = TextFormField(
        autofocus: false,
        controller: passwordEditingController,
        obscureText: true,
        onSaved: (value) {
          passwordEditingController.text = 'value';
        },
        textInputAction: TextInputAction.done,
        decoration: const InputDecoration(
            prefixIcon: Icon(Icons.vpn_key),
            contentPadding: EdgeInsets.fromLTRB(200, 15, 20, 15),
            prefixIconColor: Colors.red,
            border: OutlineInputBorder(
                borderSide: const BorderSide(
                    width: 2, color: Color.fromARGB(26, 204, 32, 32))),
            hintText: 'Password ',
            suffixIcon: Icon(Icons.remove_red_eye_rounded)));

Solution 1:^[1]

You can wrap parent Card widget padding or just use margin property for outside spacing, and wrap Column widget with padding to provide inner spacing.

Card(
  //for out side or wrap with padding widget
  margin: const EdgeInsets.all(8.0), 
  color: Colors.cyanAccent,

  // for inner spaciing
  child: Padding(
    // replace 16 with your desire padding value
    // padding: const EdgeInsets.all(16.0),
    padding:
        EdgeInsets.only(left: 16, top: 16, right: 16, bottom: 16),
    child: Column(
      children: [
        TextField(),
        //...
      ],
    ),
  ),
)

More about Padding and Card.

Solution 2:^[2]

You can achieve that through decoration property, here is a sample. Pay attention that there is more than one type of borders styling you can apply.

the docs are very clear and straight to the point in explaining that https://api.flutter.dev/flutter/material/InputDecoration-class.html

 decoration: InputDecoration(                
              border: InputBorder.none,
              enabledBorder: OutlineInputBorder(
                borderSide: const BorderSide(
                    color: Color.fromARGB(255, 223, 223, 223), width: 1.5),
              ),

Sources

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Source: Stack Overflow

Solution	Source
Solution 1	Yeasin Sheikh
Solution 2	Sinan Ammar

'How do I decrease the border width of the text form field?

Solution 1:[1]

Solution 2:[2]

Sources

Related Questions

Solution 1:^[1]

Solution 2:^[2]