JSFiddle - React, Tailwind, and code Playground

by NickU

HTML

<script src="https://code.jquery.com/jquery-3.6.0.js"></script>

<div id="container">
    <button id="toggle_form">Login</button>
    <form id="RegForm" class="form">
        <div id="username-wrapper" class="wrapper">
            <label for="inp_username">Username</label>
            <input type="text" id="reg_username" class="input_field" name="inp_username">
        </div>
        <div id="password-wrapper" class="wrapper">
            <label for="inp_password">Password</label>
            <input type="text" id="reg_password" class="input_field" name="inp_password">
        </div>
        
        <button id="SubmitReg" type="submit" class="SubBtn">Register</button>
    </form>
    
    <form id="LoginForm" class="form">
        <div id="username-wrapper" class="wrapper">
            <label for="inp_username">Username</label>
            <input type="text" id="login_username" class="input_field" name="inp_username">
        </div>
        <div id="password-wrapper" class="wrapper">
            <label for="inp_password">Password</label>
            <input type="text" id="login_password" class="input_field" name="inp_password">
        </div>
        
        <button id="SubmitLogin" type="submit" class="SubBtn">Login</button>
    </form>
</div>

CSS

* { 
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

.form { 
 display: inline-block;
 border: 1px solid;
 padding: 10px;
 position: absolute;
 width: 100%;
 height: 100%;
 background-color: #f1f1f1;
}

#RegForm {
    top: 0px;
    left:0px;
}


#LoginForm {
    top: 0;
    left:-100%;
    opacity: 0;
}


.input_field { 
    display: block;
    padding: 10px;
    width: 100%;
}

.wrapper { 
    
    text-align: center;
}

.SubBtn { 
    padding: 15px;
    width: 100%;
    font-size: 20px;
    cursor: pointer;
    margin-top: 10px;
    background-color:rgb(10, 157, 248);
    border: none;
    color: white;
}

.wrapper label { 
    display: inline-block;
    padding: 10px;
    font-size: 20px;
}

#container { 
    position: relative;
    width: 300px;
    height: 250px;
    display: inline-block;
    top: 100px;
    left:200px;
}

#toggle_form { 
    position: relative;
    top:-50px;
    left: 130px;
    padding: 5px;
}

JavaScript

function line(mark)
{
     var token = 'line\\(' + mark + '\\)';       
       
    var m = line.caller.toString().match(
        new RegExp('(^(?!.*' + token + '))|(' + token + ')', 'gm')) || [];
    var i = 0;
    for (; i < m.length; i++) if (m[i]) break;
    return i + 1;
}

function foo()  
{       
    alert(line(1));
    var a;
    var b;      
    alert(line(2));
}   
foo();