五、背景
一、有偏移量的背景图片定位
1、使用background-position

background: #ccc url(1.png) no-repeat;
background-position: right 10px bottom 10px;
2、用calc()计算

background:#ccc url(1.png) no-repeat;
background-position: calc(100% - 20px) calc(100% - 20px);
3、改变定位的基准

padding: 5px;
background: #ccc url(1.png) no-repeat right bottom;
background-origin: centent-box;
二、制作条纹背景
1、制作横向条纹背景

background: linear-gradient(#ccc 50%,#555 50%);
background-size: 100% 30px;
2、制作大小不一的横向条纹背景
background: linear-gradient(#ccc 30%,#555 0);
background-size: 100% 30px;
3、制作多种颜色的横向条纹背景

background: linear-gradient(#fb3 33.3%,#58a 0, #58a 66.6%, yellowgreen 0);
background-size: 100% 45px;
4、制作垂直条纹
background: linear-gradient(to right,#fb3 50%,#58a 0);
background-size: 30px 100%;
5、制作斜向条纹
background: linear-gradient(45deg,#fb3 25%, #58a 0, #58a 50%,#fb3 0, #fb3 75%, #58a 0);
background-size: 30px 30px;
6、制作60°的斜向条纹
background: repeating-linear-gradient(60deg,#fb3, #fb3 15px, #58a 0, #58a 30px)
7、同一色系的条纹

background: #444;
background-image: repeating-linear-gradient(30deg,
hsla(0, 0%, 100%, .1),
hsla(0, 0%, 100%, .1) 15px,
transparent 0, transparent 30px);
三、直角切角效果
1、一个切角效果

background: #333; //设定保险,如果浏览器不支持linear-gradient可以得到纯色背景
background: linear-gradient(-45deg, transparent 15px, #333 0);
2、两个切角的效果
background: linear-gradient(45deg, transparent 15px, #555 0) left,
linear-gradient(-45deg, transparent 15px, #333 0) right;
background-size: 50% 100%; //不设定会出现重叠现象
background-repeat: no-repeat; //不设定会出现重复现象
background: #333;
background: linear-gradient(135deg, transparent 15px, #555 0) top left,
linear-gradient(-135deg, transparent 15px, #333 0) top right;
background-size: 50% 100%;
background-repeat: no-repeat;

background: #333;
background: linear-gradient(135deg, transparent 15px, #555 0) top left,
linear-gradient(45deg, transparent 15px, #333 0) bottom left;
background-size: 100% 50%;
background-repeat: no-repeat;
3、四个切角效果
background: #333;
background: linear-gradient(135deg, transparent 15px, #555 0) top left,
linear-gradient(45deg, transparent 15px, #333 0) bottom left,
linear-gradient(-135deg, transparent 15px, #444 0) top right,
linear-gradient(-45deg, transparent 15px, #222 0) bottom right;
background-size: 50% 50%;
background-repeat: no-repeat;
四、弧形切角效果
background: #333;
background: radial-gradient(circle at top left, transparent 15px, #555 0) top left,
radial-gradient(circle at bottom left, transparent 15px, #333 0) bottom left,
radial-gradient(circle at top right, transparent 15px, #444 0) top right,
radial-gradient(circle at bottom right, transparent 15px, #222 0) bottom right;
background-size: 50% 50%;
background-repeat: no-repeat;
五、裁剪做切角

background: #333;
clip-path: polygon(20px 0, calc(100% - 20px) 0, 100% 20px, 100% calc(100% - 20px), calc(100% - 20px) 100%, 20px 100%, 0 calc(100% - 20px), 0 20px);

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