[Duda] Diseño | JS en la Web: Almacenando datos en el navegador | Alura Latam

Hola, tengo una duda, porque en mi página me salen las barras laterales de desplazamiento? A Harland no lo sale así, ¿Porqué a mi si?

Ingrese aquí la descripción de esta imagen para ayudar con la accesibilidad Solo dejo el código de html y css porque no creo que lo demás afecte a eso...

<!DOCTYPE html>
<html lang="es">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>TO-DO App</title>
    <link rel="icon" type="image/png" href="./assets/rocket.svg" />
    <link rel="preconnect" href="https://fonts.gstatic.com" />
    <link
      href="https://fonts.googleapis.com/css2?family=Dosis&family=Open+Sans&family=Parisienne&display=swap"
      rel="stylesheet"
    />
    <link
      href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.css"
      rel="stylesheet"
    />
    <link rel="stylesheet" href="styles.css" />
  </head>
  <body>
    <main>
      <div class="mainCard">
        <div class="title"><img src="./assets/rocket.svg" /></div>
        <div>
          <form action="">
            <input
              type="text"
              name="task"
              placeholder="Nombre de la tarea"
              class="inputForm"
              autocomplete="off"
              data-form-input
            />
            <input type="datetime-local" data-form-date placeholder="YYYY/MM/DD"/>
            <button type="submit" class="btnCreate" data-form-btn>
              Agregar <i class="fas fa-plus-circle"></i>
            </button>
          </form>
        </div>
        <ul class="cardsList" data-list>

        </ul>
      </div>
    </main>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/uuid/8.3.2/uuid.min.js" integrity="sha512-UNM1njAgOFUa74Z0bADwAq8gbTcqZC8Ej4xPSzpnh0l6KMevwvkBvbldF9uR++qKeJ+MOZHRjV1HZjoRvjDfNQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.4/moment.min.js"></script>
    <script type="module" src="script.js"></script>
  </body>
</html>

* {
  margin: 0;
  padding: 0;
  font-family: 'Dosis', sans-serif;
  font-size: 16px;
}

main {
  background-image: linear-gradient(
    109.6deg,
    rgba(62, 161, 219, 1) 11.2%,
    rgba(93, 52, 236, 1) 100.2%
  );
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

form {
  width: 100%;
  justify-content: space-between;
  align-items: center;
  display: flex;
  margin-bottom: 15px;
}

.mainCard {
  width: 40vw;
  border-radius: 25px;
  background-color: #fff;
  padding: 25px;
}

.title {
  font-family: 'Dosis', sans-serif;
  display: flex;
  justify-content: center;
  align-content: center;
  margin-bottom: 15px;
}

.inputForm {
  border: none;
  padding: 10px;
  border: 1px solid #eee;
  outline: none;
  width: 35%;
}

.inputForm::placeholder {
  padding: 0px;
}

.btnCreate {
  padding: 10px 15px;
  background-image: linear-gradient(
    109.6deg,
    rgba(62, 161, 219, 1) 11.2%,
    rgba(93, 52, 236, 1) 100.2%
  );
  border: none;
  color: #fff;
  border-radius: 5px;
  cursor: pointer;
}

.cardsList {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  overflow-y: scroll;
  max-height: 60vh;
  height: 60vh;
}

.card {
  width: 90%;
  padding: 15px;
  box-shadow: 2px 4px 4px 4px rgba(71, 71, 71, 0.16);
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-content: center;
  margin: 5px 0px;
  position: relative;
}

.task {
  padding: 10px;
}

.icon {
  cursor: pointer;
}

.icon:hover {
  color: rgba(62, 161, 219, 1);
}

.completeIcon {
  color: rgba(62, 161, 219, 1);
}

.trashIcon:hover {
  color: #f00;
}

.deleteConfirmationPop {
  position: relative;
  background-color: rgba(255, 255, 255);
  z-index: 99;
  width: 100%;
  top: -100px;
  left: 0;
}
.deleteSpace {
  position: relative;
  width: 30%;
}

.noTasks {
  font-size: 48px;
}

.date{
  width: 100%;
  padding: 15px;

}