Custom CSS mod to widen the browser tabs of Vivaldi Snapshot no longer works in 6.9.3405.3

[mgunt5]

My CSS mod no longer works in Vivaldi Snapshot 6.9.3405.3. Here is the CSS code that no longer works.

html {
    --tab-size-multiplier: 1.58 !important;
}

html #browser.linux.maximized ,
html #browser.linux.fullscreen {
    --tab-size-multiplier: 1.58 !important;
}

html #browser.linux.maximized .tab-position.is-pinned,
html #browser.linux.fullscreen .tab-position.is-pinned {
    --tab-size-multiplier: 1 !important;
}

html .tab-position.is-pinned {
    --tab-size-multiplier: 1 !important;
}
.tab-position {
    transform: translateX(calc(var(--PositionX)*var(--tab-size-multiplier))) translateY(calc(var(--PositionY)*var(--tab-size-multiplier))) !important;
    height: calc(var(--Height)*var(--tab-size-multiplier)) !important;
    width: calc(var(--Width)*var(--tab-size-multiplier)) !important;
}
#tabs-subcontainer .tab-position {
    transform: translateX(calc(var(--PositionX)*var(--tab-size-multiplier))) translateY(calc(var(--PositionY)*var(--tab-size-multiplier))) !important;
    height: calc(var(--Height)*var(--tab-size-multiplier));
    width: calc(var(--Width)*var(--tab-size-multiplier));
}
.tabbar-wrapper .newtab {
    left: calc(var(--PositionX)*var(--tab-size-multiplier)) !important;
    top: calc(var(--PositionY)*var(--tab-size-multiplier)) !important;
}
#browser.tabs-top .svg-tab-stack, #browser.tabs-bottom .svg-tab-stack {
    width: calc(var(--Width)*var(--tab-size-multiplier)) !important;
}
#browser.tabs-left .svg-tab-stack, #browser.tabs-right .svg-tab-stack {
    height: calc(var(--Height)*var(--tab-size-multiplier)) !important;
}
#browser.tabs-top, #browser.tabs-bottom {
    & #tabs-tabbar-container {
        padding-right: calc(0px) !important;
        padding-left: calc(0px) !important;
   }
    & #tabs-subcontainer.visible {
        width: 100vw;
   }
}

Would appreciate it if someone can help me find a new CSS mod that widens the tabs of Vivaldi browser. The default tab width is too short for my liking.