Css code confusion

[OBXKH]

please see https://botanicgardentravelers.org/

there are 2 arrows on the "banner" at smaller screen sizes

how do i remove them?

many thanks!

 

[cornucopia]

This looks like it was originally an image slider. If you remove the --<a id="previous"-- and --<a id="next"-- then the arrows should disappear