给元素添加透明样式（方块块）

.div-name {
    background-image: linear-gradient(45deg, #f4f4f5 25%, #f000 25%), linear-gradient(135deg, #f4f4f5 25%, #0000 25%), linear-gradient(45deg, #0000 75%, #f4f4f5 75%), linear-gradient(135deg, #0000 75%, #f4f4f5 75%);
    background-size: 20px 20px;
    background-position: 0px 0px, 10px 0px, 10px -10px, 0px 10px;
}