.upcart-upsell-item-variant-selector {     
  color: white !important;  
  background-color: #008060 !important;   
}

.upcart-public-component-upsell-tile__variant-row select {  
  color: white;     
  background-color: #008060;   
}

.upcart-public-component-upsell-tile__variant-row select {     
  color: #000000 !important;     
  background-color: #f3f4f6 !important;   
}