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              <div class="container">
    <div class="row">
        <div class="col-sm-6">
            <form method="post">
                <div class="well">
                    <div class="form-group">
                        <label for="required">Campo requerido</label>
                        <input type="text" id="required" name="required" required class="form-control">
                    </div>
                    <div class="form-group">
                        <button type="submit" class="btn btn-primary">
                            Validar
                        </button>
                    </div>
                </div>
            </form>
        </div>
        <div class="col-sm-6">
            <form method="post">
                <div class="well">
                    <div class="form-group">
                        <label for="email">Campo tipo email</label>
                        <input type="email" id="email" name="email" required class="form-control">
                    </div>
                    <div class="form-group">
                        <button type="submit" class="btn btn-primary">
                            Validar
                        </button>
                    </div>
                </div>
            </form>
        </div>
        <div class="col-sm-6">
            <form method="post">
                <div class="well">
                    <div class="form-group">
                        <label for="url">Campo tipo URL</label>
                        <input type="url" id="url" name="url" required class="form-control">
                    </div>
                    <div class="form-group">
                        <button type="submit" class="btn btn-primary">
                            Validar
                        </button>
                    </div>
                </div>
            </form>
        </div>
        <div class="col-sm-6">
            <form method="post">
                <div class="well">
                    <div class="form-group">
                        <label for="number">Campo con solo números</label>
                        <input type="number" id="number" name="number" required class="form-control">
                    </div>
                    <div class="form-group">
                        <button type="submit" class="btn btn-primary">
                            Validar
                        </button>
                    </div>
                </div>
            </form>
        </div>
        <div class="col-sm-6">
            <form method="post">
                <div class="well">
                    <div class="form-group">
                        <label for="letters">Campo con solo letras o un formato determinado</label>
                        <input type="text" id="letters" name="letters" required pattern="[a-zA-Z]*" class="form-control">
                    </div>
                    <div class="form-group">
                        <button type="submit" class="btn btn-primary">
                            Validar
                        </button>
                    </div>
                </div>
            </form>
        </div>
    </div>
</div>
            
          
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