.feed {
    position: relative;
    overflow: hidden;
    height: 100%;

    flex: auto;
}
.feed .header {
    position: absolute;
    width: 100%;
}
.feed .content {
    display: block;
    height: 100%;
}

/* ios无效 */
::-webkit-scrollbar {
    -webkit-overflow-scrolling: auto;
    width: 0;
    height: 0;
    color: transparent;
}