バックグラウンドを斜めにカット
-webkit-clip-path: polygon(0 132px,100% 0,100% 100%,0 calc(100% - 132px));
clip-path: polygon(0 132px,100% 0,100% 100%,0 calc(100% - 132px));
-webkit-clip-path: polygon(0 132px,100% 0,100% 100%,0 calc(100% - 132px));
clip-path: polygon(0 132px,100% 0,100% 100%,0 calc(100% - 132px));