src/components/Chat/Chat.css

.chat {
  background: var(--white);
  position: absolute;
  top: 4rem;
  bottom: 4rem;
  right: 0;
  overflow-y: auto;
  width: 400px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  border-left: 1px solid var(--grey);
}

.chat.hidden {
  width: 0;
}

#cometchat {
  width: 100%;
  height: 100%;
}

@media only screen and (max-width: 600px) {
  .chat {
    width: 100%;
    z-index: 3; /* overlay the usernames in the Call screen*/
  }
}

.add-message {
  padding: 1rem;
  border-top: 1px solid var(--grey);
  border-bottom: 1px solid var(--grey);
}

.chat-messages {
  padding: 1rem;
  margin: 0;
  height: 100%;
  overflow-y: auto;
}

.chat-message {
  list-style-type: none;
  margin-bottom: 1rem;
}

.chat-message-author {
  font-weight: bold;
  font-size: 14px;
}

.chat-message-body {
  text-align: left;
  margin: 0;
  display: inline;
  color: var(--dark-grey);
  font-size: 14px;
}

.chat-form {
  display: flex;
  justify-content: space-between;
  border-bottom: 2px solid var(--grey);
}

.chat-input {
  background: transparent;
  border: 0;
  flex-grow: 1;
  padding: 0.5rem;
}

.chat-submit-button {
  background: transparent;
}

.close-chat {
  background: var(--turquoise);
  border: 1px solid var(--grey);
  padding: 0.1em 0.2rem;
  align-self: end;
  font-weight: normal;
}

.close-chat:hover {
  background: var(--grey);
  border: 1px solid var(--dark-blue-border);
}