模板:Background/styles.css

.bl-page-bg {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
z-index: 0;
background-size: cover;
background-position: center;
background-repeat: no-repeat;
}

#mw-content-container {
position: relative;
z-index: 1;
}