.links-box{
    width: 100%;
    display: block;
    position: relative;
    min-height: 100vh;
    box-sizing: border-box;
    padding: 100px 0;
    background-color: #333;
}
.links-all-box{
    width: 1280px;
    max-width: 100%;
    display: block;
    margin: 0 auto;
    position: relative;
    font-size: 0;
    box-sizing: border-box;
    padding: 130px 0;
}
.links-title-box{
    text-align: center;
}
.links-info-box{
    margin-top: 130px;
}
.links-info{
    width: 273px;
    display: inline-block;
    vertical-align: top;
    position: relative;
    border: 1px solid #666;
    background-color: #888;
    transition: all .3s linear;
    border-radius: 5px;
    margin-right: 60px;
}
.links-info:nth-child(4n){
    margin-right: 0;
}
.links-info:nth-child(n + 5){
    margin-top: 60px;
}
.links-info-img{
    box-sizing: border-box;
    padding-bottom: 100%;
    overflow: hidden;
    position: relative;
}
.links-info-img .main-bg{
    position: absolute;
    top: 0;
    left: 0;
    background-size: contain;
}




@media only screen and (max-width: 1280px){
    .links-all-box{
        width: 1200px;
    }
    .links-info{
        margin-right: 40px;
        width: 268px;
    }
    .links-info:nth-child(n + 5) {
        margin-top: 40px;
    }
}
@media only screen and (max-width: 1200px){
    .links-all-box{
        width: 1000px;
    }
    .links-info{
        margin-right: 20px;
        width: 233px;
    }
    .links-info:nth-child(n + 5) {
        margin-top: 20px;
    }
}
@media only screen and (max-width: 1000px){
    .links-all-box{
        width: 750px;
        padding: 60px 0;
    }
    .links-info-box{
        margin-top: 60px;
    }
    .links-info:nth-child(n){
        margin-right: 15px;
        margin-top: 0;
        width: 238px;
    }
    .links-info:nth-child(3n) {
        margin-right: 0;
    }
    .links-info:nth-child(n + 4) {
        margin-top: 15px;
    }
}
@media only screen and (max-width: 768px){
    .links-box{
        padding: 60px 0;
        padding-bottom: 40px;
    }
    .links-all-box{
        width: 550px;
        padding: 40px 0;
    }
    .links-info-box{
        margin-top: 40px;
    }
    .links-info:nth-child(n){
        margin-right: 20px;
        margin-top: 0;
        width: 168px;
    }
    .links-info:nth-child(3n) {
        margin-right: 0;
    }
    .links-info:nth-child(n + 4) {
        margin-top: 20px;
    }
}
@media only screen and (max-width: 550px){
    .links-box{
        padding-bottom: 20px;
    }
    .links-all-box{
        width: 95vw;
        padding: 20px 0;
    }
    .links-info-box{
        margin-top: 20px;
    }
    .links-info:nth-child(n){
        margin-right: 10px;
        margin-top: 0;
        width: calc(((100% - 10px) / 2) - 2px);
    }
    .links-info:nth-child(2n) {
        margin-right: 0;
    }
    .links-info:nth-child(n + 3) {
        margin-top: 10px;
    }
}


@media only screen and (min-width: 769px){
    .links-info:hover{
        box-shadow: 0px 0px 20px rgba(255, 255, 255, 0.1);
    }
}