ul{ list-style: none; width: 100%; margin: auto;}
.li1{ float: left; background: red; width: 25%; -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box; border: 3px solid #000000; text-align: center;}
.list2{ display: flex;}
.li2{ flex: 1; text-align: center;}
.list3{ display: flex; justify-content: space-around;}
