img.talker_icon {
  width: 70%;
}

@media (min-width: 641px) {
  img.talker_icon {
    margin-top: -25px;
    margin-right: -10px;
    margin-bottom: 10px;
  }
  img.talker_icon[alt="いいじま"] {
    margin-top: -30px;
  }
  #talk_body dd {
    margin-bottom: 4em;
  }
}
@media (max-width: 640px){
  img.talker_icon {
    width: 30%;
    max-width: 100px;
    margin-left: -15px;
  }
}