Hello,

Please use the below custom CSS code:

/*CSS for SAFARI*/
@media screen and (min-color-index:0) and(-webkit-min-device-pixel-ratio:0)
{ @media {
    header.whb-header.whb-full-width.whb-sticky-shadow.whb-scroll-stick.whb-sticky-real.whb-hide-on-scroll.whb-sticky-prepared {
    margin-bottom: 0px;
}
.main-page-wrapper {
    margin-top: 0px;
    padding-top: 0px;
}
header.whb-header.whb-full-width.whb-sticky-shadow.whb-scroll-stick.whb-sticky-real.whb-hide-on-scroll.whb-sticky-prepared {
    padding-top: 0px !important;
}
}}

I am sure your issue will be solved on Safari.

Best Regards.