body {
    background-image: url("https://files.catbox.moe/kh9nt1.png");
    background-size: cover;
}

.box { 
    background-image: url("https://files.catbox.moe/lmrjkr.png");
    background-size: 100% 100%;
    background-attachment: scroll;
    border: none;
}

#header { 
    background-image: url("https://files.catbox.moe/lmrjkr.png");
    background-attachment: scroll;
    border: none;
}