with a percentage value for padding-bottom , like this: .demoWrapper { The CSS property aspect-ratio lets you create boxes that maintain proportional dimensions where the height and width of a box are calculated automatically as a ratio. The aspect ratio of an element describes the proportional relationship between its width and its height. background-size: cover; Scale the image, while preserving its intrinsic aspect ratio (if any), to the smallest size such that both its width and its height can completely cover the background positioning area. Elliot inspired me to this solution - thanks: aspectratio.png is a completely transparent PNG-file with the size of your preferred aspect-ratio, i If youre using CSS grid of flexbox, the width will be optional and it can be added to act as a minimum value. when resize the browser window. There are several ways to specify a fixed aspect ratio on an element like a div, here are 2 of them: 1. The aspect-ratio CSS property div { This class is a CSS class in which we have set the aspect ratio to auto and specified its width to be 400px. Aspect ratio is an image projection attribute, which determines the proportional relationship between the width of an image and its height. In order to maintain the aspect ratio of a div with CSS create flexible elements that keep their aspect ratio (4:3, 16:9, etc.) When browsers render an , they maintain the aspect ratio for the image. flyflydogdog. It sets a preferred aspect ratio for the box, which will be used in the calculation of auto sizes and some other layout functions. I find two ways, but I don't want to do this: remove img-box wrap. box-s Two common video aspect ratios are 4:3 and 16:9. The aspect-ratio property is good for controlling aspect ratio of div elements if the div elements are supposed to vary in size. How to maintain aspect ratio using HTML IMG tag, Maintain the aspect ratio of an image with CSS for small screens, Keep aspect ratio of image css, Resize image on hover but keep aspect ratio and inside screen. 154 1 10. By specifying padding of an element in percentage, we can maintain its Aspect Ratio. How do I manage the aspect ratio of an image?Drag the cropping handles to change the picture to the dimensions you want.Click OK to keep your changes.In the Aspect Ratio box, select the ratio you want to use, and then select the Landscape or Portrait orientation.To crop your picture, click OK. Different aspect ratio have different background: black; use max-height: 100vh; max-width: 100vw; in img tag. W3Guides. Size calculations involving intrinsic aspect ratio always work with the As @web-tiki already show a way to use vh / vw , I also need a way to center in the screen, here is a snippet code for 9:16 portrait. .container The aspect ratio of an element describes the proportional relationship between its width and height. This has the benefit of updating other properties, like font-size, too. padding: 10px; As stated in here on w3schools.com and somewhat reiterated in this accepted answer , padding values as percentages (emphasis mine): Specifies th It works at the first level, but when trying to do the same thing inside of the div maintaining aspect ratio, the padding-bottom percentage seems to get applied to the width Cover always fills the browser window, cutting off some hair or ears in the process, which is what I personally prefer for most cases. This fiddle demonstrates the fixed aspect ratio for the div, and the text matching its scale exactly. Follow. For the auto value, height will be adjusted automatically according to the size of the image like this: Now, we will change the aspect ratio like this: .images{ aspect-ratio: 2 / 1; width: 400px; } background: white; img { That is if the width is specified, then height will be automatically set maintaining the aspect css. Using aspect-ratio css property. If you have multiple iframes inside of a flex container, you can set the aspect ratio to 16/9 (the most common ratio for YouTube videos) and the width to 100%:.video { aspect-ratio: 16 / 9; width: 100%; } Heres a demo that illustrates this technique on CodePen. So for the 16:9 aspect ratio, it means that the ratio is 16 units of width to 9 units of height. 1. Two common video aspect ratios are 4:3 (the universal video format of the 20th century), and 16:9 (universal for HD television and European digital television, and default for YouTube videos). [1:05] In review, we can use CSS variables to maintain an aspect ratio for our Aspect-ration defines the proportional relationship between the width of an element and its height. Adding a custom aspect ratio. Go to the Lens tool tab or long-press the Crop tool in the Cursor toolbar. Select Add aspect ratio from the list. Add a name and the ratio dimensions needed in the dialog box. Press OK. The new ratio will appear in the Ratio drop-down menu. Select ImageBrowse and select the image you want to crop or resize.Drag-and-drop the image file.Paste the image from the clipboard (Ctrl-V or V). The padding-bottom specifies the bottom To maintain the aspect ration of an element with CSS, the code is as follows . To maintain the aspect ratio of the div add a percentage value for padding-top. asked 3 mins ago. width: 500px; Its a ratio of width to height. Step 2) Add CSS: Add a percentage value for padding-top to maintain the aspect ratio of the DIV. To add to Web_Designer's answer, the