Tạo khung đặt code cho Blogspot

pre, code {
  display:block;
  font: 1em 'Courier New', Fixed, monospace;
  font-size : 100%;
  color: #666666;
  background : #fff url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgUyLJrmBDkj_RWbA9PpU_cVGr5b751_n4MdEJQYBtveCeUAfs1vGMPUtHybcoqaXYWnS69-o9_mFstpMeGQj6p0_zibISXKVl9h75sjX5rpY1bHtxs38W_D_F7ejAumwy3m1Tlp-JxGAc/s1600/prepb3-namkna-blogspot-com-1.jpg) no-repeat left top;
  overflow : auto;
  text-align:left;
  border : 1px solid #99cc66; 
  padding : 0px 20px 0 30px;
  margin:1em 0 1em 0;
  line-height:17px;
}