.probox {
    width: 80%;
    height: auto;
    overflow: hidden;
    margin: 60px auto 50px auto;
}
.prom {
    width: 340px;
    height: auto;
    overflow: hidden;
    float: left;
    background: #7d7c7c;
    border-radius: 30px;
    margin-top: 50px;
}
.prom a {
    display: block;
    line-height: 55px;
    color: #fff;
    text-align: center;
    text-decoration: none;
    font-weight: bold;
    font-size: 16px;
}
.prom a:nth-child(1) {
    font-size: 28px;
    line-height: 80px;
}
.prom a.on, .prom a:hover {
    background: #4097dd;
}
.pror {
    width: calc(100% - 440px);
    height: auto;
    float: right;
    overflow: hidden;
}
.prot {
    font-size: 16px;
    line-height: 26px;
    padding-bottom: 10px;
    padding-left: 3%;
    font-weight: bold;
}
.proli {
    height: auto;
    overflow: hidden;
    margin-bottom: 20px;
}
.proli a {
    display: block;
    width: 27%;
    height: 260px;
    margin: 20px 3%;
    float: left;
    text-decoration: none;
}
.proli a img {
    display: block;
    width: 100%;
    height: 180px;
    margin-bottom: 30px;
}
.proli a span {
    display: block;
    line-height: 30px;
    font-size: 18px;
    font-weight: bold;
    text-align: center;
}

@media screen and (max-width: 1680px) {
    .prom {
        width: 320px;
    }
    .prom a:nth-child(1) {
        font-size: 26px;
    }
    .pror {
        width: calc(100% - 400px);
    }
    .proli a {
        height: 240px;
    }
    .proli a img {
        height: 160px;
    }
    .proli a span {
        font-size: 16px;
    }
}
@media screen and (max-width: 1440px) {
    .prom {
        width: 300px;
    }
    .prom a {
        line-height: 50px;
    }
    .prom a:nth-child(1) {
        font-size: 26px;
        line-height: 70px;
    }
    .pror {
        width: calc(100% - 380px);
    }
    .proli a {
        height: 220px;
    }
    .proli a img {
        height: 140px;
    }
    .proli a span {
        font-size: 16px;
    }
}
@media screen and (max-width: 1280px) {
    .probox {
        width: 85%;
        margin: 40px auto;
    }
    .prom {
        width: 260px;
    }
    .prom a {
        line-height: 45px;
        font-size: 14px;
    }
    .prom a:nth-child(1) {
        font-size: 24px;
        line-height: 60px;
    }
    .pror {
        width: calc(100% - 320px);
    }
    .proli a {
        height: 200px;
    }
    .proli a img {
        height: 140px;
    }
    .proli a span {
        font-size: 14px;
    }
}
@media screen and (max-width: 1024px) {
    .probox {
        width: 90%;
    }
    .prom {
        width: 250px;
    }
    .prom a {
        line-height: 40px;
    }
    .pror {
        width: calc(100% - 300px);
    }
    .proli a {
        height: 180px;
    }
    .proli a img {
        height: 120px;
    }
    .proli a span {
        font-size: 14px;
    }
}