Feel free to use the following images in your html templates. Just copy the source and paste it in your html.

https://files2.vtcdn.net/_assets/images/close_x_white.png

https://files2.vtcdn.net/_assets/images/close_x_white.png

https://files2.vtcdn.net/_assets/images/close_cross.png

https://files2.vtcdn.net/_assets/images/close-icon-white-border.png

https://files2.vtcdn.net/_assets/images/close_simple.png

https://files2.vtcdn.net/_assets/images/close.png

https://files2.vtcdn.net/_assets/images/close_simple2.png

https://files2.vtcdn.net/_assets/images/close_simpleX.png

https://files2.vtcdn.net/_assets/images/close_window1600.png

https://files2.vtcdn.net/_assets/images/close_x_black.png

https://files2.vtcdn.net/_assets/images/close_x_black.png

https://files2.vtcdn.net/_assets/images/close_x_gray.png

https://files2.vtcdn.net/_assets/images/stars_0.png

https://files2.vtcdn.net/_assets/images/stars_1.png

https://files2.vtcdn.net/_assets/images/stars_2.png

https://files2.vtcdn.net/_assets/images/stars_3.png

https://files2.vtcdn.net/_assets/images/stars_4.png

https://files2.vtcdn.net/_assets/images/stars_5.png

https://files4.vtcdn.net/_assets/icons/sm/twitter-circular.png

https://files4.vtcdn.net/_assets/icons/sm/facebook.png

https://files4.vtcdn.net/_assets/icons/sm/instagram.png

https://files4.vtcdn.net/_assets/icons/sm/linkedin.png

https://files4.vtcdn.net/_assets/icons/sm/youtube.png