.index {
    /* background-color: #f4f4f4; */
    width: 100%;
    min-width: 1230px;
}
.main {
    width: 1200px;
    margin: 0 auto;
    background-color: #fff;
    overflow: hidden;
    padding: 40px 0 110px;
}
.main-bg {
    width: 100%;
    height: 300px;
    background: url(bmbanner.jpg) no-repeat center;
    background-size: 100% 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}
.common-title {
    height: 50px;
    line-height: 50px;
    background-color: #f5f5f5;
    margin-bottom: 40px;
}
.common-title span {
    display: block;
    width: 198px;
    height: 50px;
    line-height: 50px;
    font-size: 24px;
    font-weight: bold;
    color: #ffffff;
    text-align: center;
    background: url(title.png) no-repeat center;
}
.common-year {
    display: flex;
    flex-wrap: wrap;
    margin-bottom: 40px;
    font-size: 0;
}
.year-box {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 280px;
    height: 45px;
    background-color: #ffffff;
    border: solid 1px #115db2;
    text-align: center;
    color: #404040;
    font-size: 16px;
    margin-right: 12px;
    margin-bottom: 10px;
}
.common-year .year-box:nth-of-type(4n) {
    margin-right: 0;
}
.common-year .year-box:hover {
    background-color: #115db2;
    color: #fff;
    font-weight: bold;
}
.box {
    /* background-color: #ffffff;
    border-radius: 0px 0px 8px 8px; */
}
.box .box-title {
    font-size: 24px;
    height: 50px;
    line-height: 50px;
    font-weight: bold;
    color: #fff;
    text-align: center;
    margin-bottom: 50px;
    background: url(bt.png) no-repeat center;
}
.box .special-title {
    background: url(bt2.png) no-repeat center;
}
.box-block {
    margin-top: 30px;
    display: flex;
    flex-wrap: wrap;
    margin-bottom: 50px;
}
.box-block .box-b {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 230px;
    height: 45px;
    background-color: #ffffff;
    border: solid 1px #999999;
    text-align: center;
    color: #404040;
    font-size: 16px;
    margin-right: 12px;
    margin-bottom: 10px;
}
.box-block .box-b:nth-of-type(5n) {
    margin-right: 0;
}
.box-block .box-b:hover {
    background-color: #115db2;
    color: #fff;
}
@media screen and (max-width: 768px) {
    .index {
        width: 100%;
        min-width: auto;
    }
    .main {
        width: 100%;
        padding: 10px;
    }
    .main-bg {
        background-size: 100% 100%;
        height: 120px;
    }
    .main-bg .title {
        font-size: 24px;
    }
    .main-bg .title::after {
        display: none;
    }
    .box-block{
        margin-bottom: 20px;
    }
    .box .box-title {
        margin-bottom: 20px;
    }
    .box {
        margin-top: 10px;
    }
    .box-block .box-b,
    .common-year .year-box {
        margin-right: 0;
        width: 100%;
    }
    .common-title span{
        margin: 0 auto;
    }
}
@media screen and (max-width: 320px) {
}