body {
  background: url("https://i.ibb.co/qW8SfYc/green040.gif") repeat center ;

}

.box{
  width: 750px;
  height: 550px;
  background-color: rgb(90, 132, 140);
  position: relative;
  top: 180px;
  left: 330px;
  }

.header{
  width: 750px;
  height: 200px;
  background-image: url("C:\Users\maddy\Downloads\download (5).jpeg");
  position: relative;
  bottom: 550px;
  left: 330px;
  
}