body {
    background-image: url('/p/pic1.png');
}
div {
    background-image: url('/p/pic2.png');
}
p {
    background-image:url('/p/pic3.png');
}
h1 {
    background-image:url('/p/pic4.png');
}

h2 {
    background-image: url('http://external-img1.png')
}
h3 {
    background-image: url('http://external-img2.png')
}
h4 {
    background-image:url('http://external-img3.png')
}
h5 {
    background-image:url('http://external-img4.png')
}