@media (max-width:320px) {

    /* smartphones, iPhone, portrait 480x320 phones */
    .logo-container {
        display: none;
    }
    .quantity,.quantity-nav{
        width: 100%;
    }
    .quantity input{
        width:100% !important;
    }
    .cart-btn,a{
        width: 100%;
    }

    .quantity{
        margin-bottom: 10px;
    }
    .cart-btn a{
        margin-bottom: 10px;
        text-align: center;
    } 

    .product-detail{
        width: initial;
    }
    .quantity-nav{
        height:0px;
    }
  
    .screen-hidden{
        display: none;
    }
    
}

@media (max-width:481px) {

    /* portrait e-readers (Nook/Kindle), smaller tablets @ 600 or @ 640 wide. */
    .logo-container {
        display: none;
    }
    .quantity,.quantity-nav{
        width: 100%;
    }
    .quantity input{
        width:100% !important;
    }
    .cart-btn,a{
        width: 100%;
    }

    .quantity{
        margin-bottom: 10px;
    }
    .cart-btn a{
        margin-bottom: 10px;
        text-align: center;
    } 

    .product-detail{
        width: initial;
    }
    .quantity-nav{
        height:0px;
    }
    .screen-hidden{
        display: none;
    }
}

@media (max-width:641px) {

    /* portrait tablets, portrait iPad, landscape e-readers, landscape 800x480 or 854x480 phones */
    .logo-container {
        display: none;
    }
    #header_options{
        justify-content: space-around;
        float:initial;
    }
    .quantity,.quantity-nav{
        width: 100%;
    }
    .quantity input{
        width:100% !important;
    }
    .cart-btn,a{
        width: 100%;
    }

    .quantity{
        margin-bottom: 10px;
    }
    .cart-btn a{
        margin-bottom: 10px;
        text-align: center;
    } 

    .product-detail{
        width: initial;
    }
    .quantity-nav{
        height:0px;
    }
    .screen-hidden{
        display: none;
    }
}