How to create a linear gradient background in CSS? (Code Examples)
使用CSS的linear-gradient()函数可创建线性渐变背景，支持方向控制（如to right、45deg）、多色停靠点、透明度（rgba）及浏览器兼容回退色。
To create a linear gradient background in CSS, use the background or background-image property with the linear-gradient() function. It lets you define two or more colors that blend smoothly along a straight line.
Basic syntax and direction
The simplest linear gradient goes from top to bottom (default). You can control direction using keywords like to right, to bottom right, or degree values like 45deg.
-
background: linear-gradient(to right, red, blue);— left to right -
background: linear-gradient(135deg, #ff9a9e, #fad0c4);— diagonal (top-left to bottom-right) -
background: linear-gradient(to bottom, #3498db, #2c3e50);— top to bottom (explicit)
Adding color stops and multiple colors
You’re not limited to two colors. Specify exact positions using percentages or lengths to fine-tune transitions.
-
background: linear-gradient(to right, #ff0000, #ffff00 50%, #00ff00);— yellow stops exactly halfway -
background: linear-gradient(90deg, #6a11cb 0%, #2575fc 50%, #00c9ff 100%);— three-color horizontal sweep
Using transparency and fallbacks
Include rgba() for transparent gradients. Always declare a solid background color before the gradient as a fallback for older browsers.
-
background: #333;— fallback color -
background: linear-gradient(to bottom, rgba(255,255,255,0), rgba(0,0,0,0.8));— fade-to-dark overlay
Applying to elements and pseudo-elements
Gradients work on any element with a background — buttons, cards, headers, or even ::before/::after.
button { background: linear-gradient(45deg, #ff6b6b, #4ecdc4); }.card::before { content: ''; position: absolute; background: linear-gradient(to top, rgba(0,0,0,0.6), transparent); }
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