REVIBE update

Hi,
I made the update of template REVIBE

https://casinomobilerm.com/

1- I have 2 slider in the main page for desktop thumb slider and another one for the mobile. One of your partner do that since at the time the thumb slider wasn't work well in mobile. Now thw mobile slider is sqeeze and distort in mobile when you change oriantation. I try to mask the mobile slider but I think in it in the custom CSS code and don't know whitch one
here is the custom CSS code.
I hope with all the updates the thumb slider should work on mobile now?

#sp-header { top: 0; }
#sp-header, #sp-header .logo { height: 50px; }
.sp-megamenu-parent > li > a, #offcanvas-toggler { line-height: 50px; }
.sp-megamenu-parent .sp-dropdown .sp-dropdown-items { margin-top: -15px; }


.sp-page-title {
    padding: 20px 0px 30px 0px;
    position: relative;
    text-align: left;
}

.sp-page-title h1 {
    font-size: 30px;
    line-height: 1;
letter-spacing : 2px;
    font-weight: 700;

}


.helix-social-share-icon {display: none; visibility: hidden;}


.slider-sub-title {
font-size : 26px !important;
  letter-spacing : 2px !important;
  margin-top : 18px;
}

.slide_thumb_wrap {
    display: none;
}

.sp-simpleportfolio-meta {display: none;}


@media screen and (max-width: 640px)  {
.sppb-addon-thumb-gallery #slider .slides > li .thumb-slider-bg {
    max-height: 330px;
    -webkit-background-size: cover;
    background-size: cover;
    background-position: 50% 50%;
    min-height: 0 !important;}

#slider {padding:0px !important;}
#sp-page-builder .page-content .sppb-section.sppb-hidden-md.sppb-hidden-lg.sppb-hidden-sm {
    padding: 0px 0 !important;
}
}



#sp-page-builder .page-content .sppb-section, #sp-page-builder .sppb-section {
    margin-top: 0px;
    z-index: 1;
    position: relative;
}

2- I replace the header-border.png and since then the header-border.png is not centered anymore in
https://casinomobilerm.com/

how do load image now in the new support?
Thank you