In css, you can use the linear-gradient() or radial-gradient() gradient function together with rgba() to set the opacity gradient. linear-gradient() and radial-gradient() can set gradients, and rgba() can control opacity.
The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.
In css, you can use the linear-gradient() or radial-gradient() gradient function with rgba() to set the opacity gradient.
The linear-gradient() and radial-gradient() functions can set the gradient effect:
-
linear-gradient(): Create a linear gradient
radial-gradient(): Create a radial gradient
rgba() function uses red (R), green (G), blue (B) , transparency (A) overlay to generate a variety of colors.
Code example:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>图片透明度渐变实例演示</title>
<style>
div{
box-sizing: border-box;
width: 400px;
height: 320px;
font-size: 22px;
padding-top: 100px;
overflow: hidden;
background: no-repeat center top / 100% 100%;
}
.div1 {
background-image: url(img/1.jpg)
}
.div2 {
background-image: linear-gradient(to top, rgba(255, 255, 255, 1), rgba(255, 255, 255, 0)), url(img/1.jpg)
}
.div3 {
background-image: radial-gradient(rgba(255, 255, 255, 0) 50%, rgba(255, 255, 255, 0.5),rgba(255, 255, 255, 1)), url(img/1.jpg)
}
</style>
<div class="div1">正常图片</div><br>
<div class="div2">设置线性渐变不透明度效果的图片</div>
<div class="div3">设置径向渐变不透明度效果的图片</div>
</body>
</html>Rendering:
##Description:
In order to create a linear gradient, you must define at least two color nodes. The color node is the color you want to show a smooth transition. At the same time, you can also set a starting point and a direction (or an angle). The syntax is as follows:background-image:linear-gradient(direction, color-stop1, color-stop2, ...);Example:
background-image:radial-gradient(shape size at position, start-color, ..., last-color);Example:
css video tutorial)
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