如何“填充”背景图片？ [复制]

I'm making a website where I need to have a notable difference between fill and center background images. My template is this:
Center: Uses native resolution to determine size. Fill: Fits sides to fill screen without changing aspect ratio. Two sides exactly fit screen, while other two are cut off.

我设法以

.center {
    background-repeat: no-repeat;
    background-size: auto auto;
    background-position: center center;
}

但我不知道如何填充。有什么见解吗？

我相信你想要background-size: cover. 其他背景大小选项 https://developer.mozilla.org/en-US/docs/Web/CSS/background-size.