#foot{text-align: center;padding: 1em 0;
    /*background-color: #006699;*/
    margin-top: 2em;}
.f-bottom{
    position: absolute;bottom: 0;right: 0;left: 0;
}
.f-item{display: inline-block;margin: 0 0.8em;font-size: 16px;color: #fff;}
.f-item a{color: #fff;text-decoration: none;}
.f-item a:hover,
.f-item a:active,
.f-item a:focus {
    text-decoration: none; /* 移除悬停时的下划线 */
    color: #fff; /* 保持悬停时的颜色不变 */
}
.f-item img{height: 18px;width: auto;vertical-align: top;display: inline-block;}