*|.b1 {
  border: 2px solid #3bb234;
  background-repeat: no-repeat;
  background-position:  center center;
  background-color: #ddf2db;
}
*|.b2 {
  border: 4px solid #3bb234;
}
*|.b3 {
  border: 6px solid #3bb234;
}