myaac/system/templates/admin.login.html.twig

<div class="login-box">
    {% if logout %}
        <div class="alert alert-success alert-dismissible">
            <button type="button" class="close" data-dismiss="alert" aria-hidden="true">×</button>
            <h4><i class="icon fa fa-check"></i> Status</h4>
            {{ logout }}
        </div>
    {% endif %}

    <form method="post">
        <div class="box box-info">
            <div class="box-header with-border">
                <h3 class="box-title">Please login.</h3>
            </div>
            <div class="box-body">
                <div class="form-group">
                    <div class="form-group input-group">
                        <span class="input-group-addon"><i class="fa fa-lock"></i></span>
                        <input type="password" class="form-control" id="account-name-input" name="account_login"
                               placeholder="Account Name" required autofocus>
                    </div>
                    <div class="form-group input-group">
                        <span class="input-group-addon"><i class="fa fa-key"></i></span>
                        <input type="password" class="form-control" placeholder="Password" name="password_login"
                               placeholder="Password" required>
                    </div>
                </div>
            </div>
            <div class="box-footer">
                <label>
                    <input type="checkbox" id="remember_me" name="remember_me" value="true"> Remember me
                </label>
                <input type="hidden" name="admin" value="1"/>
                <button type="submit" class="btn btn-info pull-right">Sign in</button>
            </div>
        </div>
    </form>
</div>