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The `z-index` property determines the vertical stacking order of elements on a web page, deciding which elements are displayed above or below others.

A value of 0 for the `opacity` property makes an element fully transparent, rendering its content invisible.

With `object-fit: cover;`, the image covers the entire element, cropping to show only the significant parts that fit within the element's dimensions.

The default value `visible` for the `overflow` property means that content extending beyond the element's boundaries remains displayed.

The `overflow: hidden;` value hides and clips the content that extends beyond the boundaries of the element, making it invisible.

`@keyframes` is used in CSS to define how styles should be applied at specific points during the animation's progress.

`animation-direction` specifies the playback direction of an animation, while `animation-iteration-count` sets how many times the animation should repeat. To make the animation repeat indefinitely, use 'infinite' as the value.

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