How to Set Calc Viewport Units Workaround in CSS ? Last Updated : 30 Jun, 2020 Comments Improve Suggest changes Like Article Like Report In the HTML webpage, when applying values to the CSS properties, the calculations are performed by using calc() function. Syntax: element { // CSS property property : calc( expression) } Properties: The calc() function takes parameters in the form of a single expression. The value becomes the result of the expression. Even the expression be the combination of many operators follow the standard precedence rules. + Addition - Subtraction * Multiplication. Any of the arguments should be a number / Division. The right-hand side should be a number One must be careful while writing the syntax and must take care of the following points. The + and - operator must be surrounded by white space i.e. height(100%-30px) is considered to be invalid but height(100% - 30px) is a valid expression. For the / and * operator, the white spacing is not necessary but is highly recommended. Division by 0 results in an error. Example 1: html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content= "width=device-width, initial-scale=1.0"> <title> CSS Calc Viewport Units Workaround </title> <style> body { background-color: rgb(30, 240, 30); } h1 { color: rgb(30, 240, 30); } div { width: calc(100% - 100px); /* Using the calc() func to change the width of the div element by 100px */ border: 1px solid black; background-color: white; margin-top: 50px; text-align: center; } </style> </head> <body> <div> <h1>working of the calc() function</h1> </div> </body> </html> output: Example 2: html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content= "width=device-width, initial-scale=1.0"> <title> CSS Calc Viewport Units Workaround </title> <style> body { background-color: rgb(30, 240, 30); } h1 { color: rgb(30, 240, 30); /* Using the calc() func to change the font size of the h1 element */ font-size: calc(1.5rem + 3vw); } div { width: calc(100% - 100px); border: 1px solid black; background-color: white; margin-top: 50px; text-align: center; } </style> </head> <body> <div> <h1> working of the calc() function</h1> </div> </body> </html> Output: Comment More infoAdvertise with us Next Article CSS Introduction J jainanjali733985 Follow Improve Article Tags : Web Technologies CSS CSS-Questions Similar Reads CSS Tutorial CSS stands for Cascading Style Sheets. 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