JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="en">
<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">
    <script src="https://kit.fontawesome.com/1e10f2d5f9.js" crossorigin="anonymous"></script>
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css">
    <link rel="stylesheet" href="style.css">
    <title>ToDoList App</title>
</head>
<body>

    <div class="top-bar">
        <div class="top-bar-logo"><i class="fas fa-clipboard-list"></i></div>
        <div class="top-bar-title">ToDo App</div>
    </div>


    <div class="main-container">
        <div class="left-side">
            <div class="side-bar-title">New Project</div>
            <div class="project-input">
                <form id='project-form'>
                    <div class="form-group" >
                      <label for="title">Title</label>
                      <input type="text" class="form-control" id="title" placeholder="">
                    </div>
                    <div class="form-group">
                      <label for="priority">Priority</label>
                      <select class="form-control" id="priority">
                        <option>1</option>
                        <option>2</option>
                        <option>3</option>
                        <option>4</option>
                        <option>5</option>
                      </select>
                    </div>
                    <div class="form-group">
                      <label for="due-date">Due Date</label>
                      <input type="date" class="form-control" id="due-date">
                    </div>
                    <div class="form-group">
                      <label for="description">Description</label>
                      <textarea class="form-control" id="description" rows="3"></textarea>
                    </div>
                    <button...

CSS

.top-bar{
    background-color: white;
    width: 100%;
    height: 100px;
    font-size: 40px;
    display: flex;
    padding-left: 30px;
    justify-content: center;
    align-items: center;
}

.top-bar-title{
    padding-left: 15px;
}


.main-container{
    background-color: #D9E6EB;
    width: 100%;
    min-height: 100vh;
    display: grid;
    grid-template-columns: 20% 80%;
}

.left-side{
    /* border: 2px black solid; */
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #fff;
}

.side-bar-title{
    text-transform: uppercase;
    font-weight: 600;
    font-size: 1.4rem;
    letter-spacing: 1px;
    background-color: #D9E6EB;
    color:black;
    width: 100%;
    height: 150px;
    text-align: center;
    line-height: 150px;
    display: flex;
    flex-direction: column;
}

.project-input{
    margin-top: 20px;
}






.right-side{
    display: flex;
    margin-top: 100px;
    margin-left: 50px;
    margin-right: 50px;
    flex-direction: column;
    
}

table{
    color:white;
}

.activity-card{

    width: 1000px;
}

table{
   table-layout: fixed;
}

td{
    word-wrap: break-word;
}

.check-button{
    cursor: pointer;
}

.remove-button{
    cursor: pointer;
}

.task-open{
    cursor: pointer;
}


.tasks-container{
    width: 500px;
    min-height: 700px;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    transition: 200ms ease-in-out;
    z-index: 10;
    border: 1px solid #D5D6D6;
    border-radius: 5px;
    background-color:#D9EDF7;
    overflow: auto;
}

.task-add{
    font-size: 22px;
}

.tasks{
    margin-top: 20px;
}

.tasks ol li{
    border-bottom: 0.5px solid grey;
}

.active {
    transform: translate(-50%, -50%) scale(1);
}

JavaScript

// DOM consts
const formButton = document.querySelector('#submit-button')
const form = document.querySelector('#project-form')
const activityPage = document.querySelector('.right-side')
const remove = document.querySelector('.remove-button')
const check = document.querySelector('.check-button');
const closeModal = document.querySelector('.modal-close')
const modalContainer = document.querySelector('.tasks-container')
const tasks = document.querySelector('.task-open')


// Table Acitvity class Constructor
class Activity {
    constructor(title, priority, description, date){
        this.title = title;
        this.priority = priority;
        this.description = description;
        this.date = date;
    }
}


// Page UI functions

class PageUI {

    static addActivity = () =>{
        form.addEventListener('submit', (e)=>{

            
        
            const titleData = document.querySelector('#title').value;
            const priorityData = document.querySelector('#priority').value;
            const descriptionData = document.querySelector('#description').value;
            const dueDate = document.querySelector('#due-date').value;
        
        
            
            let newActivity = new Activity(titleData, priorityData, descriptionData, dueDate)
        
            let newDiv = document.createElement('div');
            newDiv.classList.add('activity-card')
            newDiv.innerHTML =
            `
            <table class="table table-dark">
                            <thead>
                              <tr>
                                <th scope="col">Title</th>
                                <th scope="col">Priority</th>
                                <th scope="col">Description</th>
                                <th scope="col">Date</th>
                                <th scope="col">Tasks</th>
                                <th scope="col">Completed</th>
                                <th scope="col">Remove</th>
             ...