* Scale image.(101% - instead of 100% - avoids possible 1px white border on left of image due to rounding error */ Here is the perfect CSS for such a background image (use it on the tag): /* Set left edge of inner element to 50% of the parent element */ In this case, they would often want text to appear over the image and to have it scale down well on mobile devices. I'm guessing many people searching for this topic are trying use a large image as a "hero" background image, for example on a homepage. not only margin-left and margin-right, but also margin-top and margin-bottom are calculated with respect to width.īrowser compatibility should be no problem: Unfortunately this does only work for horizontal centering as the margin percentage calculation is always relative to the width. | +-+Īnd the transform: translateX(-50%) shifts back to the left +-+ With the added style margin-left: 50% we have +-+ We have this situation before we add the CSS +-+ If you use relative units, a margin will be calculated as percentage of the width of the parent element, while the transform will be 50% relative to the same element. That would result in zero shift, so what?īut the 50% are not the same, because context is important. Voluptatum.Īt first glance it seems that we shift 50% to the right and then 50% to the left again. Ipsum, aliquid totam repellendus non fugiat id magni voluptate, doloribus tenetur illo mollitia. Excepturi impedit esse modi, porro quibusdam voluptate dolores molestias, sit dolorum veritatis laudantium rem, labore et nobis ratione. Lorem ipsum dolor sit amet, consectetur adipisicing elit. Maxime ad cumque ut atque suscipit enim quidem. Quos exercitationem error nemo amet cum quia eaque alias nihil, similique laboriosam enim expedita fugit neque earum et esse ad, dolores sapiente sit cumque vero odit! Ullam corrupti iure eum similique magnam voluptatum ipsam. * Move to the left by 50% of own width */
* Set left edge of inner element to 50% of the parent element */
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