Почему модальное в бутстрапе не покрывает всю область?

Я пытаюсь открыть модальное окно для заполнения формы в Vue.Js с помощью Bootstrap, но модальное содержимое не охватывает весь модальный режим, а только небольшую его часть.

Я также использовал Google Materialize CSS с Boostrap (по причинам) и пытался удалить cdns Materialize CSS, но проблема в другом.

Код для модального:

<div class = "modal fade" id = "exampleModal" tabindex = "-1"   aria-labelledby = "exampleModalLabel" aria-hidden = "true">
  <div class = "modal-dialog"  >
    <div class = "modal-content">
      <div class = "modal-header">
              <div class = "form-group">
            <label for = "recipient-name" class = "col-form-label">Title:</label>
            <input type = "text" class = "form-control" id = "recipient-name" v-model = "title">
          </div>
        <button type = "button" class = "close" data-dismiss = "modal" aria-label = "Close">
          <span aria-hidden = "true">&times;</span>
        </button>
      </div>
      <div class = "modal-body">
        <form>
          <!-- <div class = "form-group">
            <label for = "recipient-name" class = "col-form-label">Title:</label>
            <input type = "text" class = "form-control" id = "recipient-name" v-model = "title">
          </div> -->
          <div class = "form-group">
            <label for = "message-text" class = "col-form-label">Content:</label>
            <textarea class = "form-control" id = "message-text" v-model = "content" rows = "5"></textarea>
          </div>
        </form>
      </div>
      <div class = "modal-footer">
        <button type = "button" class = "btn btn-secondary" data-dismiss = "modal">Close</button>
        <button type = "button" class = "btn btn-primary" @click = "saveChanges()">Save Note</button>
      </div>
    </div>
  </div>
</div>

я не стилизовал его но порядок, в котором cdns для boostrap и materilize css

    <link href = "https://fonts.googleapis.com/css?family=Saira+Semi+Condensed&display=swap" rel = "stylesheet"> 
    <link href = "https://fonts.googleapis.com/icon?family=Material+Icons" rel = "stylesheet">
    <link rel = "stylesheet" href = "node_modules/firebaseui/dist/firebaseui.css">
    <link rel = "stylesheet" href = "https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity = "sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin = "anonymous">
     <link rel = "stylesheet" href = "https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/css/materialize.min.css">
     <script src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>    
     <script src = "https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity = "sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin = "anonymous"></script>
<script src = "https://www.gstatic.com/firebasejs/4.3.0/firebase.js"></script>
<script src = "/node_modules/vue-cookie/build/vue-cookie.js'"></script>