4 切角效果

.box{
            width: 200px;
            height: 100px;
            background: orangered;
            text-align: center;
            background: linear-gradient(-45deg,transparent 15px,orangered 0);
                                                从右下到左上开始的透明色渐变到15px位置开始橙色渐变
            color: white;
        }

1 矩形切角

.box{
            width: 200px;
            height: 100px;
            background: orangered;
            text-align: center;
            background: linear-gradient(-135deg,transparent 15px,orangered 0)
            top right,
            linear-gradient(135deg, transparent 20px, orangered 0)
            top left,
            linear-gradient(-45deg,transparent 15px,orangered 0)
            bottom right,
            linear-gradient(45deg, transparent 20px, orangered 0)
            bottom left;
            color: white;    
            background-size: 50% 50%;等分成四份为每个角做出切角效果
            background-repeat: no-repeat;
        }
                        四层渐变

 .box{
            width: 200px;
            height: 100px;
            background: #58a; 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 );
        }
八个坐标定义八个角 （x轴,y轴）

2 弧形切角

径向渐变
radial-gradient(circle at top left,  transparent 15px, #58a 0) top left,
radial-gradient(circle at top right, transparent 15px, #58a 0) top right,
radial-gradient(circle at bottom right,transparent 15px, #58a 0) bottom right,
radial-gradient(circle at bottom left, transparent 15px, #58a 0) bottom left;