How to animate a straight line in linear motion using CSS ?
The linear motion of a straight line means the line will start from one point, goes to the second point, and then came back to the starting point. It is a kind of to and from motion. We will be doing it using CSS only.
Approach: The approach is to first create a straight line and then animate it using keyframes. It will be done in a two-step. First for forwarding movement and second for backward movement. The below code will follow the same approach.
HTML: In HTML, we have created a div element that is used to make a straight line.
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content= "width=device-width, initial-scale=1.0" /> <title>GeeksforGeeks</title> </head> <body> <div class="geeks"></div> </body> </html> |
CSS:
- Create a straight line by providing minimum height and width of your preference.
- Animate this straight line using before selector and provide it a linear animation with keyframes identifier named as animate.
- The animation for keyframes is very simple. For the first half-frames make width 100%(forward movement) and then reduce it to 0%(backward movement) for the next half frames.
<style> body { margin: 0; padding: 0; background: green; } .geeks { width: 400px; height: 2px; background: #fff; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); } .geeks::before { content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: green; animation: animate 5s linear infinite; } @keyframes animate { 0% { left: 0; } 50% { left: 100%; } 0% { left: 0; } } </style> |
Complete Code: In this section, we will combine both HTML and CSS code to make a straight line animation effect.
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content= "width=device-width, initial-scale=1.0" /> <title> How to animate a straight line in linear motion? </title> <style> body { margin: 0; padding: 0; background: green; } .geeks { width: 400px; height: 2px; background: #fff; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); } .geeks::before { content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: green; animation: animate 5s linear infinite; } @keyframes animate { 0% { left: 0; } 50% { left: 100%; } 0% { left: 0; } } </style> </head> <body> <div class="geeks"></div> </body> </html> |
Output:
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