text: const input = document.querySelector('input[type="range"]');
  const handle = document.querySelector('.handle');
  
  function handleUpdate(){
  	var suffix = this.dataset.sizing || '';
  	document.documentElement.style.setProperty(`--${this.name}`, this.value + suffix);
  	checkFlipAngle(this.value);
  }
  
  input.addEventListener('mousemove', handleUpdate);
  function init(){
  	document.documentElement.style.setProperty('--rotation-angle', '0deg');
  	checkFlipAngle(parseInt(document.documentElement.style.getPropertyValue('--rotation-angle')));
  }
  
  function checkFlipAngle(value){
  	if(value > 90){
  		handle.classList.add('hidden');
  	} else {
  		handle.classList.remove('hidden');
  	}
  }
  init();
  