@media screen and (max-width: 500px) {

.pic_wall picture{
  padding: 0;
}

.pic_wall picture B{
  color: gray;
  font-size: 0.8em;
  display: inline-block;
  padding-left: 7px;
}

.pic_wall picture IMG{
  width: 90%;
  margin-bottom: 20px;
}

} /*  end of media screen  */