手写网页扫雷之css部分

#ui{
    text-align: center;
}
#saolei{
    width: 500px;
    height: 500px;
    border: 1px solid #456345;
    margin: 0 auto;
    transition: all 0.5s;
}
#saolei .box{
    width: 50px;
    height: 50px;
    border: 1px solid #665544;
    box-sizing: border-box;
    float: left;
    display: flex;
    align-items: center;
    justify-content: center;
}
#saolei .box.active{
    background: rgb(194, 194, 194);
}
#saolei .box.surround{
    background: rgb(155, 66, 228);
}
#saolei .box .menu{
    display: none;
    list-style: none;
    font-size: 12px;
    padding:;
    margin:;
    position: absolute;
    width: 50px;
}
#saolei .box .menu li{
    border: 1px solid #858585;
    margin-top: 1px;
    background-color: orange;
    cursor: pointer;
}
#saolei .box .menu li:hover{
    background-color: yellow;
}

.icon{
    height: 30px;
    width: 30px;
    background-image: url(../img/flag.jpg);
    background-position: center center;
    background-size: cover;
}