一个用来显示上传进度的样式

        div {
            width: 1200px;
            height: 20px;
            background-color: coral;
            background-size: 40px 40px;
            background-image: linear-gradient(45deg, rgba(255, 255, 255, 0.14902) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.14902) 50%, rgba(255, 255, 255, 0.14902) 75%, transparent 75%, transparent)
        }