align button problem

index.scala.html

<div class="card">
    <div class="col s12">
        <div class="row">
            <!-- like <form> tag -->
            @form(routes.MainUserController.findUserByName(), 'class -> "container") { 
            <div class="input-field col s8">
                <input type="text" id="name" name="name" required placeholder="Pesquise um cliente" value="@userForm.apply(" name").value" />
            </div>
            <div class="col s4">
                <button class="btn waves-effect waves-light" type="submit"
                        name="action">
                    Buscar<i class="material-icons right">send</i>
                </button>
            </div>
            }
        </div>
    </div>
</div>