How to set height equal to dynamic width (CSS fluid layout)? Last Updated : 10 Jan, 2025 Comments Improve Suggest changes Like Article Like Report To set an element's height equal to its dynamic width in a CSS fluid layout, you can use the padding-bottom trick or the aspect-ratio property.Padding-Bottom Trick: Set height: 0; and padding-bottom to a percentage relative to the width to achieve the desired aspect ratio.Aspect-Ratio Property: Apply aspect-ratio: 1 / 1; to maintain a 1:1 ratio, ensuring height matches dynamic width.Using Padding-Bottom TrickTo make an element's height equal to its dynamic width, you can use the padding-bottom trick in CSS.Syntax:.selector { padding-bottom: percentage or calc(); } HTML <html> <head> <style> .square { width: 50%; height: 0; padding-bottom: 50%; background-color: lightblue; } </style> </head> <body> <div class="square"></div> </body> </html> In this Example:Width: The element's width is set to a percentage of its container, allowing it to be responsive.Height: Setting the height to 0 ensures it doesn't contribute to the element's dimensions.Padding-Bottom: By applying a percentage padding-bottom, the element's height becomes a proportion of its width. In this case, padding-bottom: 50% makes the height 50% of the width, resulting in a square aspect ratio.Utilizing the aspect ratioTo make an element's height equal to its dynamic width, you can use the aspect-ratio property in CSS.Syntax:.selector { aspect-ratio: width/height; } HTML <html > <head> <style> .square { width: 50%; aspect-ratio: 1 / 1; background-color: lightblue; } </style> </head> <body> <div class="square"></div> </body> </html> In this Example:Width: The element's width is set to a percentage of its container, allowing it to be responsive.Aspect-Ratio: The aspect-ratio property defines the proportion between the element's width and height. Setting it to 1 / 1 ensures the height matches the width, creating a square. 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