.nav ul li:nth-child(2) {
    border-bottom: 4px solid #53bdfd;
    cursor: pointer;
}

ul li:nth-child(2) a {
    color: #53bdfd;
}

/* 主体部分 box1 */
.box1 {
    width: 1200px;
    margin: 50px auto;
    display: flex;
}
.left_sidebar {
    width: 22%;
    padding: 20px 50px;
    margin-left: 120px;
    box-sizing: border-box;
}
.artical_box {
    width: 59%;
}
.top {
    text-align: center;
    background-color: #01a1ff;
    color: white;
    height: 105px;
}
.bottom {
    text-align: center;
    border: 1px solid #01a1ff;
    /* line-height: 43px; */
    
}
.bottom li {
    padding: 6px 10px;
    border-radius: 15px;
    margin: 10px 10px;
}
.bottom li:first-child {
    background-color: #01a1ff;
    color: white;
}
.bottom li:hover {
    cursor: pointer;
    background-color: #01a1ff;
    color: white;
}
.top h2 {
    padding-top: 35px;
}

.artical{
    width: 100%;
}


.artical_nav {
    text-indent: 5px;
    display: flex;
    line-height: 24px;
    margin: 20px auto 5px;
}

.artical_nav h2 {
    margin-left: 5px;
    border-left: 3px solid #01a1ff;
}
.artical_nav p {
    margin-top: 4px;
    width: 59%;
}

.artical_nav span {
    float: right;
    margin-top: 4px;
}

.artical_nav span:last-child {
    color: #01a1ff;
}
.artical img {
    width: 512px;
    float: left;
    margin-right: 44px;
}
.artical p {
    /* display: inline-block; */
    text-indent: 2em;
    line-height: 1.7em;
    margin-bottom: 21px;
}