css有关图片

calc 宽度高度的计算

object-fit: cover;  图片不被压缩

/* image-rendering: -moz-crisp-edges;
  image-rendering: -o-crisp-edges;
  image-rendering: -webkit-optimize-contrast;
  image-rendering: crisp-edges;
  -ms-interpolation-mode: nearest-neighbor; */

-webkit-clip-path: polygon(100% 0, 100% 80%, 50% 100%, 0 80%, 0 0);
  clip-path: polygon(100% 0, 100% 80%, 50% 100%, 0 80%, 0 0);
  图片的切割