magento2 – Magento 2: How can I change the background color of the product list?

I would like to change the color of the background in the product list from white to gray.

Here is style.css

// products grid
.product-item .mage-error {
Display: none! important;
}
.product-image-photo.img-thumbnail {
Padding: 0;
Line height: 1;
Background: none;
Border: none;
Minimum width: 100%;
Position: absolutely;
above: 0;
left: 0;
Margin: car! important;
Screen lock;
below: 0;
right: 0;
Limit radius (0);
}

.products-grid {
& .Slider-1-row .owl-item {
Upholstery: 0 15px;
}
.product-item-info {
Bottom edge: 30px;
product-top {
Position: relative;
Hidden overflow;
on {
& .photo {
Screen lock;
Height: 0px;
&:after this {
Content: "";
Position: absolutely;
left: 0;
right: 0;
above: 0;
below: 0;
Background color: # 000;
Opacity: 0;
Visibility: hidden;
.Transition (every 300ms);
z index: 3;
}
img.swatch-option-loading {
Content: none;
+ .img-hover-show {
Opacity: 0! important;
}
}
div {div
Display: none;
& .swatch-option-loading {
Screen lock;
Wallpaper: URL ("../ images / loader.svg");
Background position: middle center;
Background repetition: no repetition;
Background size: 50px car;
Background color: rgba (0,0,0,0,8);
below: 0;
Content: none;
left: 0;
min-width: unset;
z index: 1;
Position: absolutely;
right: 0;
above: 0;
}
}
}
}
.img-hover-show {
Position: absolutely;
left: 0;
right: 0;
above: 0;
below: 0;
Opacity: 0;
Visibility: hidden;
Minimum width: 100%;
.Transition (every 300ms);
}
.actions-link {
Display: Table;
Position: absolutely;
above: 0;
left: 0;
z index: 3;
Key {
Background: none;
Font size: 18px;
Line height: 1;
Color: #fff;
Border: none;
Box shadow: none;
Upholstery: 12px 14px;
Transform (scale (0));
Opacity: 0;
Visibility: hidden;
span {span {
Line height: 1;
Screen lock;
}
&:hover {
Color: @ base color;
}
}
}
&:hover {
a.photo: after {
Opacity: 0.3;
Visibility: visible;
}
.img-hover-show {
Opacity: 1;
Visibility: visible;
}
.actions-link button {
Transform (scale (1));
Opacity: 1;
Visibility: visible;
}
.tocart.btn-cart {
.transform (translate (-50%, -50%));
Opacity: 1;
Visibility: visible;
}
Product label {
Display: none;
}
}
}
product-item-details {
Upholstery pad: 11px;
Product name {
Bottom edge: 6px;
Line height: 1.1;
on {
Color: # 222;
Font size: 14px;
Written weight: 500;
&:hover {
Color: @ base color;
}
}

Enter the image description here

Someone help?