JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="fa" dir="rtl">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>سامانه دریافت رمز اینترنت</title>
</head>
<body>
    <div class="display">
        <div class="displayForm">
            <div class="displayFormOrg">
                <form id="form">
                    <input type="text" placeholder="شماره دانشجویی" id="input1">
                    <br>
                    <input type="text" placeholder="شماره شناسنامه یا ملی" id="input2">
                    <br>
                    <button id="buttonForm">دریافت</button>
                </form>
            </div>
        </div>
    </div>
    <script src="script.js"></script>
</body>
</html>

CSS

.displayForm{
            margin: 75px auto;
            width: 500px;
            height: 500px;
            box-shadow: 0 10px 30px rgba(28, 76, 156, .15);
        }
        .displayFormOrg{
            padding-top: 20%;
        }
        input{
            text-align: center;
            margin: 0px auto;
            display: block;
            width: 200px;
            height: 35px;
            border:1px solid #BCC6D0;
            box-shadow: 0 4px 10px 0 rgba(0,0,0,.03);
            border-radius: 5px;
            font-size: .85rem;
        }
        input:focus{
            outline:none;
            border-color: #777;
            box-shadow: 0 1px 4px 0 rgba(0,0,0,.1);
        }
        input:hover{
            box-shadow: 0 1px 4px 0 rgba(0,0,0,.1);
            border-color: #BCC6D0;
        }
        button{
            text-align: center;
            margin: 0px auto;
            display: block;
            width: 200px;
            height: 45px;
            background-color: #007BEC;
            border:1px solid #007BEC;
            color: #fff;
            border-radius: 3px;
            font-size: .99rem;
            cursor: pointer;
        }
        button:hover{
            background-color: #0060b9;
            -webkit-transition: all ease-in-out .4s;
            outline-color: #0b6ab6;
        }
        .inputClick{
            display: none;
        }
        #form{
            display: block;
        }
        ::-webkit-input-placeholder{
            font-size: 15px;
            color: #5B6F83;
        }

JavaScript

let valurInput2Org, valueInput1Org, valueInput2orgf, valueInput1orgf;
let button=document.querySelector('#buttonForm');
button.addEventListener('click',function(){
    let input1=document.querySelector('#input1');
    let valueInput1=input1.value;
    let valueInput1S=toString(valueInput1)
    let input2=document.querySelector('#input2');
    let valueInput2=input2.value;
    let valueInput2S=toString(valueInput2);
    if(valueInput2S.substring(0,2)=="00"){
        valurInput2Org=valueInput2S.substring(2,30)
        valueInput1Org="00"+ valueInput1S+valurInput2Org
    }else{
        valueInput2orgf=valueInput2S.substring(0,30);
        valueInput1orgf=valueInput1S+valueInput2orgf;
    }
});
let orginal=valueInput1Org||valueInput1orgf;
console.log(orginal);