<div   
  class="cart-subtotal-section"   
  style="display: flex; justify-content: space-between;"  
>  
  <span class="cart-subtotal-title">Subtotal</span>  
  <span class="cart-subtotal-value">{{UPCART_SUBTOTAL}}</span>  
</div>

.cart-subtotal-section {  
  margin-bottom: 4px;  
}  
  
.cart-subtotal-title {  
  font-size: 24px;  
  color: red;  
}  
  
.cart-subtotal-value {  
  font-size: 18px;  
  color: green  
}