BootStrap of global CSS style form

Do not use CSS Global Styles BootStrap of the form, it is not defined CSS styles

<form>
    <div>
        <label>Email address</label>
        <input type="email" placeholder="Email">
    </div>
    <div>
        <label>Password</label>
        <input type="password" placeholder="Password">
    </div>
    <div>
        <label>File input</label>
        <input type="file">
        <p>Example block-level help text here.</p>
    </div>
    <div>
        <label>
            <input> Check me out
        </label>
    </div>
    <button type="submit">Submit</button>
</form>

Results are as follows:

 

Global use CSS styles in the form of BootStrap

<form>
    <div class="form-group">
        <label for="exampleInputEmail1">Email address</label>
        <input type="email" class="form-control" id="exampleInputEmail1" placeholder="Email">
    </div>
    <div class="form-group">
        <label for="exampleInputPassword1">Password</label>
        <input type="password" class="form-control" id="exampleInputPassword1" placeholder="Password">
    </div>
    <div class="form-group">
        <label for="exampleInputFile">File input</label>
        <input type="file" id="exampleInputFile">
        <p class="help-block">Example block-level help text here.</p>
    </div>
    <div class="checkbox">
        <label>
            <input type="checkbox"> Check me out
        </label>
    </div>
    <button type="submit" class="btn btn-default">Submit</button>
</form>

Results are as follows:

 

For details, please see: Global CSS styles