/*文章卡片下载按钮*/
a.down {
    display: inline-block;
    width: 100%;
    height: 30px;
    line-height: 30px;
    border-radius: 15px;
    background: linear-gradient(to right, #4f6dee, #67bdf9);
    color: #fff;
    text-align: center;
    cursor: pointer
    text-shadow: none;
    border: none;
    outline: none;
    box-shadow: none;
    padding: 0;
    margin: 0;
}