*{
    margin: 0;
    padding: 0;
}
body{
    background-color: #fff;
    display: flex;
    justify-content: center;
}
#page{
    height: 297mm;
    width: 210mm;
    display: inline-block;
}
#page #templateImg{
    height: 100%;
    width: 100%;
    opacity: .3;
}

header{

}
main{

}
footer{

}