.common-main{overflow-x:hidden}
.development-bg{position:relative;padding:40px 0;}
.development-bg>div{position:relative;}
.development-bg:before{content:'';width:100vw;height:100%;background:#eee;position:absolute;top:0;left:50%;transform:translateX(-50%);}
.development-bg .kche-history-line{background:#ccc}