Preserving Dimension Ratio with Full Width and Height (Trimming Overflow in CSS)

I'm currently developing a full-screen background slideshow.

My query is: How can I ensure that an image fills the entire screen while maintaining its aspect ratio?

Although min-height and min-width provide some assistance, they do not maintain the aspect ratio when both are set. My goal is to have the image cropped with complete coverage of the container.

Problem Visualization

I suspect that fixing one dimension and setting the other to auto may be the solution; considering the variable image dimensions and viewport sizes, I believe I might need at least two sets of CSS rules and JavaScript to determine which should be utilized. Is there a simpler approach?

I have created a diagram to demonstrate my issue. The dark colors represent the original images, the medium shades depict the desired effect, and the lighter tones illustrate the desired overflow from the scaled-up image.

I am focusing on implementing a Ken Burns effect for a full-screen background. While I am aware of the transition challenges that lie ahead, I am optimistic that I can address them later.

Tutorial for Ken Burns Effect:

Solution Found: Appreciations to Maju for introducing me to the background-cover property. By turning the images into divs and adjusting the JavaScript + CSS in the Ken Burns code accordingly, I achieved positive results. As the script changes the element class, using Maju's CSS in a different manner or modifying the script was necessary.

javascripthtmlcssfullscreenaspect-ratio

Answer №1

If you want to utilize images as background-image in CSS, you can apply background-size to any element. If I have understood your requirements correctly, you may need something like this:

.background {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-repeat: no-repeat !important;
  background-position: 0 0 !important;
  background-attachment: fixed !important;
  -webkit-background-size: cover !important;
  -moz-background-size: cover !important;
  -o-background-size: cover !important;
  background-size: cover !important;
}
<div class="background" style="background-image: url(http://www.jurosko.cz/images/stackoverflow.png)"></div>

The "cover" property will ensure that the image always covers the entire element with the correct aspect ratio.

Although there is a new CSS style available, it is not compatible with IE/ME browsers.

https://css-tricks.com/almanac/properties/o/object-fit/

Therefore, I recommend using divs with background-image for better compatibility.

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