LayerSlider encountered a problem while it tried to show your slider.Please make sure that you've used the right shortcode or method to insert the slider, and check if the corresponding slider exists and it wasn't deleted previously.
You can use buttons with 2 styles, flat and shadow button. Both styles have 3 sizes; small, medium and large. You have the option of changing button’s background color and button’s text color. Unlimited color variation for both options.