add image in box html code example

Example 1: insert image by css

div.mydiv:after {
  content: url(image.jpg); /*url of your image*/
}

or

div.mydiv {
   width:100px; /*width of your image*/
   height:100px; /*height of your image*/
   background-image:url('image.file');
}

Example 2: image css in box

.block {
 
  width: 200px;
  height: 200px;
  background-color: lightgray;
}

.container {
  text-align: center;
}

.block img {
 width: 100px;
 height: 100px;
}