3 文本行的斑马条纹

  div{
            width: 300px;
            padding: .5em;
            line-height: 1.5;
            background: beige;
            background-size: auto 3em;
            background-origin: content-box;
            background-image: linear-gradient(rgba(0,0,0,.2) 50%,
            transparent 0);
        }