An annoying little square on Android devices in ionic3?

Recently I created an hybrid application developped with Ionic 3. I noted a little problem: sometimes a little square appears when I activate a page from the side menu.initially not show any little square but after jump new page and jump to previous screen now show little square.

Steps to reproduce:

add Below css in app:

scroll-content{ overflow-y: auto; }

.scroll-content{ overflow-y: auto !important; }

.content .scroll-content { overflow-y: auto; }