SOURCE

<div class="main-box"><div class="box2"></div></div>

.main-box {
    position: relative;
    height: 434px;
    width: 70%;
    background-image: url("//cdns.jsrun.top/css/img/logo@2x.png"), url("//cdns.jsrun.top/css/img/logo@2x.png"), url("//cdns.jsrun.top/css/img/logo@2x.png"), url("//cdns.jsrun.top/css/img/logo@2x.png");
    background-repeat: no-repeat, no-repeat, no-repeat, no-repeat;
    background-position: top left, top right, bottom left, bottom right;
    padding: 2px 2px 3px 2px;
    margin: auto;
    z-index: 999;
}

.box2 {
    position: absolute;
    left: 40px;
    right: 40px;
    top: 30px;
    bottom: 30px;
    border: 5px solid red;
    box-sizing: border-box;
}