📅  最后修改于: 2022-03-11 14:47:33.387000             🧑  作者: Mango
div.container {
background: gray;
width: 80px;
height: 80px;
display: flex;
justify-content: center;
align-items: center;
}
div.item {
background: silver;
width: 30px;
height: 30px;
}