Trying to get Vivaldi's tabs to horizontally scroll like Firefox's

scrolling-tabs.css

#browser.tabs-top #tabs-container,
#browser.tabs-bottom #tabs-container {
    overflow-y: hidden;
    overflow-x: scroll;
    margin-right: 90px;
    margin-left: 35px;
    padding-left: 0px !important;
}

#browser.tabs-top #tabs-container::-webkit-scrollbar,
#browser.tabs-bottom #tabs-container::-webkit-scrollbar {
    display: none;
}

#browser.tabs-top #tabs-container .tab-strip,
#browser.tabs-bottom #tabs-container .tab-strip {
    display: flex !important;
}

#browser.tabs-top #tabs-container .tab-position,
#browser.tabs-bottom #tabs-container .tab-position {
    position: relative !important;
    left: 0 !important;
    top: 0 !important;
    min-width: 70px;
}

#browser.tabs-top .tab-position .tab-header .title,
#browser.tabs-bottom .tab-position .tab-header {
    min-width: 70px;
}

#browser.tabs-top #tabs-container .newtab,
#browser.tabs-bottom #tabs-container .newtab {
    padding-left: 70px;
}

#browser.tabs-top #tabs-container .sync-and-trash-container,
#browser.tabs-bottom #tabs-container .sync-and-trash-container {
    padding-left: 40px;
}