You can achieve what you wanted this way.
return(
<div className='container_new'>
<h1>Counter</h1>
<span id='value' style={{ color: Count === 0 ? 'black' : 'white' }}>{Count}</span>
<div>
<button className="btn decrease" onClick={handleDecrement} >decrease</button>
<button className="btn reset" style={{color: 'black'}} onClick={() => handleReset()}>reset</button>
<button className="btn increase" onClick={() => handleIncrement()}>increase</button>
</div>
</div>
)
CLICK HERE to find out more related problems solutions.