object-fit is a CSS property that specifies how an image or video should be resized and positioned within its container. It determines how the content of the element should fit within its designated space.

Here's an example of how object-fit can be used:

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img {
  width: 300px;
  height: 200px;
  object-fit: cover;
}

In this example, the object-fit property is set to "cover", which means that the image will be scaled and cropped to fill the container while maintaining its aspect ratio.

To make an image the same height and width in CSS, you can use the "height" and "width" properties and set them to the same value. For example:

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img {
  height: 200px;
  width: 200px;
}

In the code above, both the height and width properties are set to 200px, so the image will have equal height and width of 200 pixels.

You can also use the shorthand property "object-fit" to set the image to fit within its container while maintaining its aspect ratio. The values for "object-fit" include "fill", "contain", "cover", "none", and "scale-down". Here's an example:

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img {
  height: 200px;
  width: 200px;
  object-fit: cover;
}

In the code above, the "cover" value for "object-fit" will cause the image to scale up or down while maintaining its aspect ratio until it fills its container completely, with any overflow hidden. For more information on "object-fit", check the MDN web docs page.

If your pictures have different sizes, you can use the object-fit property in CSS to scale the images to fit within their container, while preserving their aspect ratio. The object-fit property specifies how an image or video should be resized to fit its container. You can set the object-fit property to cover if you want the image to fill the container while maintaining its aspect ratio, or contain if you want the image to be completely visible within its container.

Here's an example of how you can use the object-fit property to scale your images:

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/* CSS */
.grid-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 1rem;
}

.grid-item img {
  width: 100%;
  height: 100%;
  object-fit: cover; /* or "contain" */
}

In this example, the grid-container has a grid-template-columns property that creates a 3-column grid, and images are placed within the grid using the grid-item class. The images have width and height set to 100% to ensure they fill their respective grid items, while the object-fit property is set to cover (or contain) to scale the image while maintaining its aspect ratio.

You can learn more about the object-fit property here: https://developer.mozilla.org/en-US/docs/Web/CSS/object-fit

You can try using the object-fit CSS property to ensure that images scale to the size of their containing elements. In your example, you could use the following code to make sure that the image is proportionally resized to fit within the h2 element's border:

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h2 img {
    object-fit: cover;
}

In CSS, you can use the object-fit property to shrink an image in a media query. When used in a @media query, the object-fit property allows you to size the images responsively based on the size of the browser window. For example:

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@media only screen and (max-width: 500px) {
  img {
    object-fit: cover;
    width: 100%;
  } 
}

The object-fit property supports the values fill, contain, cover and none. You can learn more about object-fit here.