Can I use the Vimeo video HTML embed on mobile and tablet to cover the full screen, even if the video has a 16:9 ratio on Vimeo?

Yes, you can use the Vimeo video HTML embed on mobile and tablet devices to cover the full screen, even if the video has a 16:9 ratio on Vimeo. Vimeo provides responsive embed codes that automatically adapt to different screen sizes.

To ensure that the Vimeo video covers the full screen on mobile and tablet devices, you can use some CSS techniques.

First, wrap the Vimeo embed code within a container div element. For example:

```html

Next, apply CSS to the container div to make it fill the entire screen. You can use viewport units (vw and vh) to achieve this effect. For example:

```css
.video-container {
width: 100vw;
height: 100vh;
}
```

This CSS code sets the width and height of the container div to 100% of the viewport width and height respectively, ensuring that it covers the entire screen on all devices.

Additionally, to ensure that the video maintains its 16:9 aspect ratio, you can use CSS techniques like padding or absolute positioning. Here's an example using padding:

```css
.video-container {
width: 100vw;
height: 0;
padding-bottom: 56.25%; /* 16:9 aspect ratio */
position: relative;
}

.video-container iframe {
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
width: 100%;
height: 100%;
}
```

In this example, the container div has a 0 height and uses padding-bottom to create a responsive aspect ratio. The iframe inside the container is then positioned absolutely and takes up the entire space of the container, maintaining the 16:9 aspect ratio.

By using these CSS techniques, you can make the Vimeo video cover the full screen on mobile and tablet devices, while keeping its original 16:9 ratio.