Thank you
To amend try adding the following to the Custom CSS field of your templates parameters (Extensions -> Templates -> [YourTemplateStyle] -> Custom CSS)....
@media only screen and (max-width: 1140px) {
#header_bg, #header_slide {
height: auto !important;
padding-bottom: 50%;
}}
@media only screen and (max-width: 986px) {
#header_slide {
padding-bottom: 60%
}}
@media only screen and (max-width: 767px) {
#header_slide {
padding-bottom: 70%
}}
Ciaran