bootstrap set the background image adaptive screen size

css edit this style:

.bg {
       background:url(图片地址) no-repeat center;
       background-size:contain;
}

Then refer to this style in your div on the line:

<div class="row bg">

That the image does not scroll with a scroll bar, i.e. is stationary plus fixd, css code is as follows:

.bg {
       background:url(图片地址) no-repeat center fixed;
       background-size:contain;
}