Web-based Kanban Board JavaScript, HTML, CSS

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```javascript
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Kanban Board</title>
  <style>
    body {
      font-family: sans-serif;
      margin: 0;
      padding: 0;
      background-color: #f4f4f4;
    }

    .kanban-container {
      display: flex;
      justify-content: space-around;
      padding: 20px;
    }

    .kanban-column {
      background-color: #eee;
      width: 250px;
      min-height: 300px;
      padding: 10px;
      border-radius: 5px;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
      flex: 1; /* Allows columns to share available space */
      margin: 0 10px; /* Adds spacing between columns */
    }

    .kanban-column:first-child {
      margin-left: 0;
    }

    .kanban-column:last-child {
      margin-right: 0;
    }

    .kanban-column h2 {
      margin-top: 0;
      text-align: center;
      font-size: 1.2em;
      margin-bottom: 10px;
    }

    .kanban-card {
      background-color: #fff;
      padding: 10px;
      margin-bottom: 10px;
      border-radius: 5px;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
      cursor: grab;
    }

    .kanban-card:active {
      cursor: grabbing;
    }

    .add-button {
      display: block;
      width: 100%;
      padding: 8px;
      margin-top: 10px;
      border: none;
      background-color: #4CAF50;
      color: white;
      border-radius: 5px;
      cursor: pointer;
      text-align: center;
      text-decoration: none;
      font-size: 1em;
    }

    .add-button:hover {
      background-color: #3e8e41;
    }

    /* Modal Styles */
    .modal {
      display: none;
      position: fixed;
      z-index: 1;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      overflow: auto;
      background-color: rgba(0, 0, 0, 0.4);
    }

    .modal-content {
      background-color: #fefefe;
      margin: 15% auto;
      padding: 20px;
      border: 1px solid #888;
      width: 80%;
      max-width: 500px;
      border-radius: 5px;
    }

    .close {
      color: #aaa;
      float: right;
      font-size: 28px;
      font-weight: bold;
      cursor: pointer;
    }

    .close:hover,
    .close:focus {
      color: black;
      text-decoration: none;
      cursor: pointer;
    }

    #new-task-description {
      width: 100%;
      padding: 8px;
      margin-bottom: 10px;
      border: 1px solid #ccc;
      border-radius: 4px;
      box-sizing: border-box; /* Important: Makes padding part of the width */
    }

    .save-task-button {
      background-color: #4CAF50;
      color: white;
      padding: 10px 15px;
      border: none;
      border-radius: 4px;
      cursor: pointer;
    }

    .save-task-button:hover {
      background-color: #3e8e41;
    }

  </style>
</head>
<body>

  <div class="kanban-container">
    <div class="kanban-column" id="todo">
      <h2>To Do</h2>
      <a href="#" class="add-button" data-column="todo" onclick="openModal('todo')">Add Task</a>
    </div>

    <div class="kanban-column" id="in-progress">
      <h2>In Progress</h2>
      <a href="#" class="add-button" data-column="in-progress" onclick="openModal('in-progress')">Add Task</a>
    </div>

    <div class="kanban-column" id="done">
      <h2>Done</h2>
      <a href="#" class="add-button"  data-column="done" onclick="openModal('done')">Add Task</a>
    </div>
  </div>

  <!-- The Modal -->
  <div id="myModal" class="modal">
    <div class="modal-content">
      <span class="close" onclick="closeModal()">&times;</span>
      <h2>Add New Task</h2>
      <label for="new-task-description">Task Description:</label>
      <textarea id="new-task-description" rows="4" cols="50"></textarea>
      <button class="save-task-button" onclick="saveNewTask()">Save Task</button>
    </div>
  </div>


  <script>
    let currentColumn = null; // Store the column to which the task should be added

    function allowDrop(event) {
      event.preventDefault();
    }

    function drag(event) {
      event.dataTransfer.setData("text", event.target.id);
    }

    function drop(event) {
      event.preventDefault();
      const data = event.dataTransfer.getData("text");
      const draggedElement = document.getElementById(data);
      const dropzone = event.target;

      // Ensure the dropzone is a kanban-column
      if (dropzone.classList.contains('kanban-column')) {
        dropzone.appendChild(draggedElement);
      } else if (dropzone.parentNode.classList.contains('kanban-column')) {
          dropzone.parentNode.appendChild(draggedElement);
      }
    }


    function openModal(columnId) {
      currentColumn = columnId;
      document.getElementById("myModal").style.display = "block";
    }

    function closeModal() {
      document.getElementById("myModal").style.display = "none";
      document.getElementById("new-task-description").value = ""; // Clear the textarea
    }


    function saveNewTask() {
      const taskDescription = document.getElementById("new-task-description").value;

      if (taskDescription.trim() !== "") {
        const newTask = createTaskCard(taskDescription);
        document.getElementById(currentColumn).appendChild(newTask);
        closeModal(); // Close the modal after saving
      } else {
        alert("Please enter a task description.");
      }
    }


    function createTaskCard(description) {
      const card = document.createElement("div");
      card.classList.add("kanban-card");
      card.textContent = description;
      card.id = "task-" + Date.now(); // Unique ID for drag/drop
      card.draggable = true;
      card.setAttribute("ondragstart", "drag(event)");
      return card;
    }

    // Close the modal if the user clicks outside of it
    window.onclick = function(event) {
      const modal = document.getElementById("myModal");
      if (event.target == modal) {
        closeModal();
      }
    }


     // Make columns droppable
     const columns = document.querySelectorAll('.kanban-column');
     columns.forEach(column => {
       column.setAttribute("ondrop", "drop(event)");
       column.setAttribute("ondragover", "allowDrop(event)");
     });
  </script>

</body>
</html>
```
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