律师网站设计基础，纯CSS3实现背景渐变等多种效果

2019-12-30
2869

背景绘制区域（显示范围）

background-clip: border-box;
background-clip: padding-box;
background-clip: content-box;

背景图像定位（起始位置，原点位置，与偏移搭配使用）

background-origin: border-box;
background-origin: padding-box;
background-origin: content-box;
background-position:10px 10px; /*与偏移搭配使用*/

background-size只写一个值，第二个默认是auto，根据比例等比缩放

background-size: contain; /*等比缩放到某一边达到容器边缘*/
background-size: cover;/*等比缩放填满容器*/
background-size: 800px 500px;
background-size: 800px;
background-size: 50% 50%;
background-size: 50%;
background-size: 100% 100%;
background-size: 100%;

background-image多重背景，前面的会覆盖后面的

background-image: url('bg2.png'), url('bg1.jpg');

demo：

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>background-image</title>
    <style type="text/css">
        div{
            width:300px;
            height:300px;
            background:url(1.jpg) no-repeat center top,
            url(2.jpg) no-repeat center 100px,
            url(3.jpg) no-repeat center 200px;
            margin:0 auto;
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>

默认从上到下渐变：

div {
    width: 800px; height: 500px;
    background: -webkit-linear-gradient(red, blue);
    background:    -moz-linear-gradient(red, blue);
    background:      -o-linear-gradient(red, blue);
    background:         linear-gradient(red, blue);
}

从左到右渐变

div {
    width: 800px; height: 500px;
    background: -webkit-linear-gradient(left, red , blue);
    background:    -moz-linear-gradient(right, red, blue);
    background:      -o-linear-gradient(right, red, blue);
    background:         linear-gradient(to right, red , blue);
}

左上角开始的对角线渐变

div {
    width: 800px; height: 500px;
    background: -webkit-linear-gradient(       left top, red, yellow, blue);
    background:    -moz-linear-gradient(   right bottom, red, yellow, blue);
    background:      -o-linear-gradient(   right bottom, red, yellow, blue);
    background:         linear-gradient(to right bottom, red, yellow, blue);
}

角度控制方向

角度渐变是水平线和渐变线之间的角度，0deg是从下到上，90度是从左到右

div {
    width: 800px; height: 500px;
    background: -webkit-linear-gradient(135deg, red, yellow, blue);
    background:    -moz-linear-gradient(135deg, red, yellow, blue);
    background:      -o-linear-gradient(135deg, red, yellow, blue);
    background:         linear-gradient(135deg, red, yellow, blue);
}

渐变具体位置控制

div {
    width: 800px; height: 500px;
    background: -webkit-linear-gradient(90deg, red 10%, orange 15%, yellow 20%, green 50%, blue 70%, indigo 80%, violet 100%);
    background:    -moz-linear-gradient(90deg, red 10%, orange 15%, yellow 20%, green 50%, blue 70%, indigo 80%, violet 100%);
    background:      -o-linear-gradient(90deg, red 10%, orange 15%, yellow 20%, green 50%, blue 70%, indigo 80%, violet 100%);
    background:         linear-gradient(90deg, red 10%, orange 15%, yellow 20%, green 50%, blue 70%, indigo 80%, violet 100%);
}

透明色渐变

div {
    width: 800px; height: 500px;
    background: -webkit-linear-gradient(90deg, rgba(255, 0, 0, 0), rgba(255, 0, 0, 1));
    background:    -moz-linear-gradient(90deg, rgba(255, 0, 0, 0), rgba(255, 0, 0, 1));
    background:      -o-linear-gradient(90deg, rgba(255, 0, 0, 0), rgba(255, 0, 0, 1));
    background:         linear-gradient(90deg, rgba(255, 0, 0, 0), rgba(255, 0, 0, 1));
}

重复渐变

div {
    width: 800px; height: 500px;
    background: -webkit-repeating-linear-gradient(90deg, red 0%, blue 10%, red 20%);
    background:    -moz-repeating-linear-gradient(90deg, red 0%, blue 10%, red 20%);
    background:      -o-repeating-linear-gradient(90deg, red 0%, blue 10%, red 20%);
    background:         repeating-linear-gradient(90deg, red 0%, blue 10%, red 20%);
}

径向渐变，从内到外

div {
    width: 800px; height: 500px;
    background: -webkit-radial-gradient(red, blue);
    background:    -moz-radial-gradient(red, blue);
    background:      -o-radial-gradient(red, blue);
    background:         radial-gradient(red, blue);
}

圆形渐变

div {
    width: 800px; height: 500px;
    background: -webkit-radial-gradient(circle, red, blue);
    background:    -moz-radial-gradient(circle, red, blue);
    background:      -o-radial-gradient(circle, red, blue);
    background:         radial-gradient(circle, red, blue);
}

椭圆形渐变

div {
    width: 800px; height: 500px;
    background: -webkit-radial-gradient(ellipse, red, blue);
    background:    -moz-radial-gradient(ellipse, red, blue);
    background:      -o-radial-gradient(ellipse, red, blue);
    background:         radial-gradient(ellipse, red, blue);
}

渐变从圆心到最近边

div.closest-side {
    width: 300px; height: 200px; margin: 50px;
    background: -webkit-radial-gradient(30% 70%, circle closest-side, red, blue);
    background:    -moz-radial-gradient(30% 70%, circle closest-side, red, blue);
    background:      -o-radial-gradient(30% 70%, circle closest-side, red, blue);
    background:         radial-gradient(30% 70%, circle closest-side, red, blue);
}

渐变从圆心到最远边

div.farthest-side {
    width: 300px; height: 200px; margin: 50px;
    background: -webkit-radial-gradient(30% 70%, farthest-side, red, blue);
    background:    -moz-radial-gradient(30% 70%, farthest-side, red, blue);
    background:      -o-radial-gradient(30% 70%, farthest-side, red, blue);
    background:         radial-gradient(30% 70%, farthest-side, red, blue);
}

渐变从圆心到最近角

div.closest-corner {
    width: 300px; height: 200px; margin: 50px;
    background: -webkit-radial-gradient(30% 70%, closest-corner, red, blue);
    background:    -moz-radial-gradient(30% 70%, closest-corner, red, blue);
    background:      -o-radial-gradient(30% 70%, closest-corner, red, blue);
    background:         radial-gradient(30% 70%, closest-corner, red, blue);
}

渐变从圆心到最远角

div.farthest-corner {
    width: 300px; height: 200px; margin: 50px;
    background: -webkit-radial-gradient(30% 70%, farthest-corner, red, blue);
    background:    -moz-radial-gradient(30% 70%, farthest-corner, red, blue);
    background:      -o-radial-gradient(30% 70%, farthest-corner, red, blue);
    background:         radial-gradient(30% 70%, farthest-corner, red, blue);
}

IE渐变从上到下

div {
    width: 800px;
    height: 500px;
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ff0000', endColorstr='#0000ff',GradientType=0 );
}

IE渐变从左到右

div {
    width: 800px;
    height: 500px;
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ff0000', endColorstr='#0000ff',GradientType=1 );
}

Demo：

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>线性渐变 - 特殊案例</title>
<style type="text/css">
div {
    width: 800px; height: 500px; background: #abcdef; background-size: 50px 50px;
    background-image:
        -webkit-gradient(linear, 0 0, 100% 100%, color-stop(.25, #555), color-stop(.25, transparent), to(transparent)),
        -webkit-gradient(linear, 0 100%, 100% 0, color-stop(.25, #555), color-stop(.25, transparent), to(transparent)),
        -webkit-gradient(linear, 0 0, 100% 100%, color-stop(.75, transparent), color-stop(.75, #555)),
        -webkit-gradient(linear, 0 100%, 100% 0, color-stop(.75, transparent), color-stop(.75, #555));
    background-image:
        -moz-linear-gradient(45deg, #555 25%, transparent 25%, transparent),
        -moz-linear-gradient(-45deg, #555 25%, transparent 25%, transparent),
        -moz-linear-gradient(45deg, transparent 75%, #555 75%),
        -moz-linear-gradient(-45deg, transparent 75%, #555 75%);
    background-image:
        -o-linear-gradient(45deg, #555 25%, transparent 25%, transparent),
        -o-linear-gradient(-45deg, #555 25%, transparent 25%, transparent),
        -o-linear-gradient(45deg, transparent 75%, #555 75%),
        -o-linear-gradient(-45deg, transparent 75%, #555 75%);
    background-image:
        linear-gradient(45deg, #555 25%, transparent 25%, transparent),
        linear-gradient(-45deg, #555 25%, transparent 25%, transparent),
        linear-gradient(45deg, transparent 75%, #555 75%),
        linear-gradient(-45deg, transparent 75%, #555 75%);
}
</style>
</head>
<body>
<div></div>
</body>
</html>