.o-thumb-img {
    width: 1001%;
    height: 100%;
    object-fit: cover; /* 效果等同于 background-size: cover */
}

/* 初始态：透明且向下偏移一点点 */
.ajax-item-fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s cubic-bezier(0.21, 0.6, 0.35, 1);
}

/* 激活态：自然升起淡入 */
.ajax-item-fade-in.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.subCopy {
    background-color:gray;
    padding:6px;
    color:#fff;
}