title: The color of the scroll bar is white in dark mode in iOS safari
body: <p>A web page with scroll made with React has white scroll bar in dark mode in mobile safari.</p>
  
  <p>Normally, scroll bars are black in other web pages.</p>
  
  <p>Why does this happen and what should I do if I want it to be black like in other web sites?</p>
  
  <p><a href="https://i.stack.imgur.com/zrRpN.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zrRpN.jpg" alt="enter image description here"></a></p>