.subgroup{margin-top:10px; display:flex;flex-wrap: wrap; justify-content:flex-start;}
.subgroup li{flex-basis:25%;font-size:13px; background:#ececec; box-sizing:border-box; border-left:#fff 10px solid; border-right:#fff 10px solid; border-bottom:#fff 20px solid;}
.subgroup li:hover,.subgroup li a:hover{background:#b72025; color:#FFF;} 
.subgroup li a{color:#231f20; text-decoration:none; display:block; padding:4px; font-weight:bold;box-sizing:border-box;}
.subgroup li img{display:block; margin-bottom:4px; width:100%; border-radius:8px;}