```html
body {
fontfamily: Arial, sansserif;
padding: 20px;
}
h1 {
textalign: center;
color: 22722a;
}
.wallpapercontainer {
display: flex;
flexwrap: wrap;
justifycontent: center;
gap: 10px;
margintop: 20px;
}
.wallpaperitem {
flex: 0 1 30%;
maxwidth: 30%;
borderradius: 10px;
overflow: hidden;
}
.wallpaperitem img {
width: 100%;
height: auto;
borderradius: 10px;
}