text: //Select DOM
  let prev = document.querySelector('.prev');
  let next = document.querySelector('.next');
  let first = document.querySelector('.first');
  
  let cont = 0;
  
  //Events
  next.addEventListener('click', imgNext);
  prev.addEventListener('click', imgPrev);
  
  //Functions
  function imgNext(){
      
      cont += 20;
  
      first.style.marginLeft = `-${cont}%`;
  
      if(cont > 80){
          cont = 0
          first.style.marginLeft = `-${cont}%`;
      }
      
  }
  
  function imgPrev(){
  
      if(cont === 0){
          cont = 0;
      }else{
          cont -= 20;
          first.style.marginLeft = `-${cont}%`;
      }
  
  }