private IEnumerator ChangeBackgroundCoroutine()
{
var targetColor1 = ColorHelper.ShiftColor(_currentColor1, _colorIncrement);
var targetColor2 = _currentColor1;
while (!ColorHelper.AreSimilar(_currentColor1, targetColor1))
{
_currentColor1 = Color.Lerp(_currentColor1, targetColor1, Time.deltaTime * _lerpSpeed);
_currentColor2 = Color.Lerp(_currentColor2, targetColor2, Time.deltaTime * _lerpSpeed);
_gradientShader.SetColor(COLOR_ONE, _currentColor1);
_gradientShader.SetColor(COLOR_TWO, _currentColor2);
yield return(null);
}
}