#div1
{
  display: block;      /* none, block, inline, inline-block */
  position: static;    /* static, absolute, fixed, relative */
  float: none;         /* none, left, right */
  z-index: 0;          /* -int,0,+int */
  visibility: visible; /* visible, hidden */
  
  margin: 3px;
  
  border-style: solid;
  border-width: 1px;
  border-color: red;

  background-image: url(); /* 照片在背景顏色之上，若有透明部分，可看到背景色 */
  background-repeat: no-repeat;

  background-color: #aaaaff;
  
  padding: 2px;
  
  box-sizing: content-box; 
  /* content-box => width = content_width 這是預設值 */
  /* border-box => width = border_width + padding-width + content_width */

  width: 100px;
  height: 200px;

  font-family: Courier;
  font-weight: normal;
  font-size: 16px;
}