.body {
      box-sizing: border-box;
      margin: 0;
      padding: 13px;
      display: flex;
      flex-direction: column;
      max-height: 100vh;
      font-family: -apple-system, BlinkMacSystemFont, sans-serif;
    }

    .members-count,
    .members-list,
    .messages {
      border: 1px solid #e4e4e4;
      padding: 15px;
      margin-bottom: 15px;
    }

    .messages {
      flex-shrink: 1;
      overflow: auto;
    }

    .message {
      padding: 5px 0;
    }
    .message .member {
      display: inline-block;
    }

    .member {
      padding-right: 10px;
      position: relative;
    }

    .message-form {
      display: flex;
      flex-shrink: 0;
    }
    .message-form__input {
      flex-grow: 1;
      border: 1px solid #dfdfdf;
      padding: 10px 15px;
      font-size: 16px;
    }
    .message-form__button {
      margin: 10px;
    }