Small black line on the screen

Hi Mojang. Some time ago, I was playing minecraft. And when I want to message my friends I feel something strange on my minecraft screen. And sure enough, after I looked carefully there was a small black line to the left of the message button (between the emotes and chat buttons). To make sure I use Texture Pack "PEWin10LookPC" so that all buttons (chat buttons, emotes, pause, controller, and inventory) invisible. When I installed the texture pack, it became clearer, if there was a small black line to the left of the message button. Please fix 🙏. Although it does not interfere with players when playing it. but, please fix it

My Device :
Name : Infinix Hot 9 Play
Chipset : MediaTek MT6761 Helio A22
Ram : 2 GB
internal memory : 32 GB
OS : Android 10