header {
    width: 100%;
    height: 120px;
    background-image: url("https://static.vecteezy.com/system/resources/thumbnails/001/431/920/small/abstract-green-background-free-vector.jpg");
}
header p {
    opacity: 0.8;   
}
div {
    width: 100%;
    height: 620px; 
}
div div {
    width: 50%;
    height: 300px;    
}
#bg {
    background-image: url();
}