message: fixed dialog footer
diff: flex-direction: column;
  }
  -.dialog .dialog__contents > div:first-child {
  +.dialog .dialog__contents form {
  + flex-grow: 1;
  + display: flex;
  + flex-direction: column;
  +}
  +
  +.dialog .dialog__contents form > div:first-child {
  flex-grow: 1;
  }
  