.simple {
    position: relative;
}
.flex-box {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
}
.flex-box .item {
    width:50%;
}
.simple .btn-banner-adm {
    position: absolute;
    right: 5px;
    top: 5px;
    display: block;
    z-index: 9999;
    width: 24px;
    height: 24px;
    text-align: center;
    line-height: 24px;
    background-color: #fff;
    color: tomato;
}