message: fix(ModalPage): centering for mobile viewport
diff: width: 100%;
  height: 100%;
  position: absolute;
  + right: 0;
  bottom: 0;
  + left: 0;
  + margin-right: auto;
  + margin-left: auto;
  display: flex;
  align-items: flex-end;
  pointer-events: initial;
  