body {
  background-image: url("https://i.pinimg.com/1200x/64/53/2d/64532dad9769e746df1aa9af0f25a414.jpg");
  background-color: white;
  color: white;
  font-family: Verdana;
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-size: cover;
}
.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}
.div1 {
  width: 600px;
  height: auto;
  margin: 0 auto;
  border: 0px solid blue;
  background-color: #000000;
  background-image: url("https://files.catbox.moe/81fz5t.gif");
}
.div2 {
  width: 1000px;
  height: auto;
  margin: 0 auto;
  border: 0px solid blue;
  background-color: #FFEA99;
}