To center a `div`, you can use CSS. There are a few methods you can try:

1. Using Auto Margins: Set the left and right margins of the `div` to `auto`. This technique will center the `div` horizontally within its parent container. Here's an example:

```html

```

2. Using Flexbox: Set the parent container's `display` property to `flex` and use the `justify-content` property set to `center`. This will center the `div` both horizontally and vertically. Here's an example:

```html

```

3. Using Positioning and Transforms: Set the `position` property of the `div` to `absolute`, followed by `left: 50%` and `top: 50%`. Then, use the `transform` property to move the `div` 50% of its width to the left and 50% of its height upwards using `translate(-50%, -50%)`. Here's an example:

```html

```

Choose the method that suits your specific needs and apply the corresponding CSS to center your `div` element.