css to achieve card-style picture effect

<div class="card">
    <img  src="/static/img/03_pingtai/03_02.jpg" alt=""/>
    <div>
        <span>打破企业间壁垒，提供便捷的接入方式，实现不企业，不同品牌、不同类型间的家电的数据互联互通和数据协同</span>
    </div>
</div>

.card img {
    width: 100%;
}
.card{
    height: 270px;
    width: 260px;
    background-color: white;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
    border-radius: 4px;
    display: inline-block;
    margin-left: 18px;
    vertical-align: top;
}
.card span {
    font-size: 12px;
    color: #BFBFBF;
    display: block;
    letter-spacing: 2px;
    padding: 30px 20px;
}