body {
    overflow-y: auto;
}
/*滚动条样式*/
    body::-webkit-scrollbar { /*滚动条整体样式*/
        width: 4px; /*高宽分别对应横竖滚动条的尺寸*/
        height: 4px;
    }

    body::-webkit-scrollbar-thumb { /*滚动条里面小方块*/
        border-radius: 5px;
        -webkit-box-shadow: inset 0 0 5px rgba(0,0,0,0.2);
        background: rgba(0,0,0,0.2);
    }

    body::-webkit-scrollbar-track { /*滚动条里面轨道*/
        -webkit-box-shadow: inset 0 0 5px rgba(0,0,0,0.2);
        border-radius: 0;
        background: rgba(0,0,0,0.1);
    }

/* 内容版心*/
.container {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
}
@media (min-width: 1200px) {
    .container {
        width: 1170px;
    }
}
@media (min-width: 992px) {
    .container {
        width: 970px;
    }
}
@media (min-width: 768px) {
    .container {
        width: 750px;
    }
}
.iframe-box {
    width :100%;
    box-sizing:border-box;
}