.container {
  max-width: 100%;
  margin: 0 auto;
  display: flex;
}

.box1 {
  width: 250px;
  height: 250px;
  background: url("https://images.unsplash.com/32/Mc8kW4x9Q3aRR3RkP5Im_IMG_4417.jpg?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxzZWFyY2h8Mnx8YmFja2dyb3VuZHxlbnwwfHwwfHw%3D&auto=format&fit=crop&w=500&q=60") no-repeat;
  background-origin: border-box;
  border: 5px dashed #000;
  padding: 5px;
  margin: 5px;
}

.box2 {
  width: 250px;
  height: 250px;
  background: url("https://images.unsplash.com/32/Mc8kW4x9Q3aRR3RkP5Im_IMG_4417.jpg?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxzZWFyY2h8Mnx8YmFja2dyb3VuZHxlbnwwfHwwfHw%3D&auto=format&fit=crop&w=500&q=60") no-repeat;
  border: 5px dashed #000;
  background-origin: padding-box;
  padding: 5px;
  margin: 5px;
}

.box3 {
  width: 250px;
  height: 250px;
  background: url("https://images.unsplash.com/32/Mc8kW4x9Q3aRR3RkP5Im_IMG_4417.jpg?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxzZWFyY2h8Mnx8YmFja2dyb3VuZHxlbnwwfHwwfHw%3D&auto=format&fit=crop&w=500&q=60") no-repeat;
  border: 5px dashed #000;
  background-origin: content-box;
  padding: 5px;
  margin: 5px;
}