form {
  width: 400px;
}

#chat form {
  width: auto;
}

#chat {
  position: absolute;
  right: 0;
  bottom: 0;
}

.chat_list {
  float: right;
  border: 1px solid black;
  list-style-type: none;
  overflow: auto;
  width: 120px;
  height: 300px;
  margin: 0;
  padding: 0;
}

.chat_list li {
  width: 100%;
  padding: 10px 0;
  background-color: #0099ff;
}

.chat_list li:nth-child(odd) {
  background-color: #80ccff;
}

.chat_list span {
  margin: 10px;
}

.chat_session {
  float: left;
  width: 250px;
  height: 300px;
}