CSS Program to Animated Gradient Background with Explanation
CSS
Hard
Transitions & Animations
18 views
1 min read
86 words
This problem helps you practice core CSS fundamentals in a practical way. It builds intuition around gradient, background, html. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Animate a gradient background on a banner.
Input Format
No input.
Output Format
Print the HTML+CSS code in one block.
Constraints
Use background-size and keyframes on background-position.
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
<!doctype html>
<html lang='en'>
<head>
<meta charset='utf-8'>
<meta name='viewport' content='width=device-width, initial-scale=1'>
<title>meetcode</title>
<style>
@keyframes move { 0% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } 100% { background-position: 0% 50%; } }
.banner { padding: 24px 16px; border-radius: 16px; color: #fff; background: linear-gradient(120deg, #0b5, #0a58ca, #c1121f); background-size: 200% 200%; animation: move 5s ease infinite; }
</style>
</head>
<body>
<div class='banner'>meetcode</div>
</body>
</html>
Output Example
No sample I/O is provided for this question.
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Solution Guide
Problem
Animate a gradient background on a banner.
Input / Output
Output
Print the HTML+CSS code in one block.
Constraints
Use background-size and keyframes on background-position.
Details
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Official Solution
<!doctype html>
<html lang='en'>
<head>
<meta charset='utf-8'>
<meta name='viewport' content='width=device-width, initial-scale=1'>
<title>meetcode</title>
<style>
@keyframes move { 0% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } 100% { background-position: 0% 50%; } }
.banner { padding: 24px 16px; border-radius: 16px; color: #fff; background: linear-gradient(120deg, #0b5, #0a58ca, #c1121f); background-size: 200% 200%; animation: move 5s ease infinite; }
</style>
</head>
<body>
<div class='banner'>meetcode</div>
</body>
</html>
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