<ion-content
[delegate-handle=""]
[direction=""]
[locking=""]
[padding=""]
[scroll=""]
[overflow-scroll=""]
[scrollbar-x=""]
[scrollbar-y=""]
[start-x=""]
[start-y=""]
[on-scroll=""]
[on-scroll-complete=""]
[has-bouncing=""]
[scroll-event-interval=""]>
...
</ion-content>

padding
(optional)
boolean    
Whether to add padding to the content. Defaults to true on iOS, false on Android.

The above is the description of ionic official document. You only need to add padding="fasle" to the ion-content tag.

I directly force the use of !important to kill - -