:root:not([uidensity="touch"]) #tabs-newtab-button > .toolbarbutton-icon {
  --toolbarbutton-inner-padding: calc((var(--tab-min-height) - 16px) / 2 - 1px);
}

:root:not([uidensity="compact"]) #tabs-newtab-button > .toolbarbutton-icon {
  margin-left: 2px;
}
:root[uidensity="compact"] #tabs-newtab-button > .toolbarbutton-icon {
  margin-left: 1px;
}