css3 & background & background-image
https://developer.mozilla.org/en-US/docs/Web/CSS/background-image
https://developer.mozilla.org/en-US/docs/Web/CSS/background
/* .layui-layer-setwin .layui-layer-close1 {
background-position: 0 0;
cursor: pointer;
background: url(./close.png) !important;
} */
/* 81x42 */
.layui-layer-setwin .layui-layer-close1 {
background-position: -28px -33px;
cursor: pointer;
background: url(./close.png) no-repeat !important;
26px;
height: 26px;
margin-top: -14px;
margin-left: 11px;
padding: 0;
}
<span class="layui-layer-setwin">
<a class="layui-layer-ico layui-layer-close layui-layer-close1" href="javascript:;"></a>
</span>
css3 & background-image
https://css-tricks.com/perfect-full-page-background-image/
https://css-tricks.com/almanac/properties/b/background-image/
https://www.sitepoint.com/background-image-css-property/
https://www.w3schools.com/Css/css3_backgrounds.asp
https://www.w3schools.com/cssref/css3_pr_background.asp
https://www.w3schools.com/cssref/pr_background-image.asp
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