calculator build with java script

Example heading with h2 size

let inputBox = document.getElementById('inputBox');
let buttons = document.querySelectorAll('button');
let string =''

buttons.forEach(element => {
element.addEventListener('click',(b) =>{
if(b.target.innerText=='='){
string =String(eval(string));
inputBox.value = string;
}

else if(b.target.innerText=='AC'){
  string=''
  inputBox.value = string;
}
  else if(b.target.innerText == 'DEL'){
  string = string.substring(0,string.length-1) ; 
  inputBox.value = string;
}
else{
  string += b.target.innerText
  inputBox.value = string
}

})

})