Hi there!

Thanks for contacting us.

Is it the first slider?

If yes, then please use the following code in your custom CSS:

@media (max-width: 767px){
.main-slidshow.sppb-addon-sp-slider .sp-item .sp-background::after {
    background: none;
}
}

Note: Path towards custom CSS(Joomla 4): System>Site Templates Styles> Click on your current default template name then choose Template Options. Then find custom CSS within the custom code.

https://prnt.sc/5mBuSRh907N3

https://prnt.sc/ooiq-lkMEXr_

https://prnt.sc/nunlX-f5AhK1

Best Regards

Hi Rashida:

Thanks for the prompt response, but your custom code generates an Error Message:-

++++++ 0 Call to a member function addStyledeclaration() on null ++++++

See screenshot below:-