.left_nav{
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    display: flex;
    align-items: center;
    z-index: 999;
}
.left_nav_small{
    width: 30px;
    height: 130px;
    background: linear-gradient(top, #FFA54F, #ff9d4d);
    background: -ms-linear-gradient(top, #FFA54F, #ff9d4d);
    background: -webkit-linear-gradient(top, #FFA54F, #ff9d4d);
    background: -moz-linear-gradient(top, #FFA54F, #ff9d4d);
    display: none;
    align-items: center;
    flex-direction: column;
    justify-content: center;
    cursor: pointer;
}
.left_nav_small .icon{
    width: 20px;
    height: 20px;
    fill: currentColor;
    overflow: hidden;
    color: #fff;
    cursor: pointer;
}
.left_nav_small p{
    font-size: 14px;
    color: #fff;
}
/* .left_nav_small:hover img{
    transform: rotate(180deg);
} */
.left_nav_big{
    border: 1px #1e4ba0 solid;
    overflow: hidden;
    width: 150px;
}
.left_nav_big .left_big_top{
    height: 36px;
    background: #ff9d4d;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 5px;
    box-sizing: border-box;
}
.left_nav_big .left_big_top h4{
    color: #fff;
    font-size: 14px;
    margin-left: 8px;
    margin-left: 36px;
}
.left_nav_big .left_big_top .gb{
    /* width: 14px;
    cursor: pointer;
    transition: .5s; */
    width: 20px;
    height: 20px;
    fill: currentColor;
    overflow: hidden;
    color: #fff;
    cursor: pointer;
}
.left_nav_big{
    background: #F0F9FF;
    border: 4px solid #9CD0FA;
}
.left_nav_big ul{
    margin: 0;
    padding: 0;
    padding-bottom: 4px;
    border-bottom: 1px solid #C4E9FE;
}
.left_nav_big ul li{
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 8px;
    margin: 12px 0;
    box-sizing: border-box; 
    position: relative;
}
.left_nav_big ul li span{
    color: #666;
    font-size: 12px;
}
.left_nav_big ul li div{
    background: #527abf;
    display: flex;
    align-items: center;
    font-size: 12px;
    color: #fff;
    padding: 4px;
    border-radius: 4px;
    position: relative;
}
.left_nav_big ul li div a{
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
}
.left_nav_big ul li div img{
    width: 20px;
}
.left_nav_big>p{
    color: #666;
    font-size: 14px;
    padding: 5px 12px;
    box-sizing: border-box;
}
.left_nav_big>span{
    color: #666;
    font-size: 12px;
    padding: 2px 12px;
    box-sizing: border-box;
    display: flex;
    line-height: 20px;
    justify-content: center;
}
.left_nav_big .gotop{
    padding: 6px 12px;
    font-size: 14px;
    color: #fff;
    background-color: #f0ad4e;
    margin-top: 10px;
    text-align: center;
    cursor: pointer;
}
/* .left_nav_big .gb:hover{
    transform: rotate(180deg);
} */
#gotop{
    width: .6rem;
    height: .6rem;
    position: fixed;
    right: 1.4%;
    bottom: 100px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #666;
    font-size: .18rem;
    cursor: pointer;
    flex-direction: column;
    background: #eee;
}
#gotop .icon{
    width: .3rem;
    height: .3rem;
    fill: currentColor;
    overflow: hidden;
    color: #FFA54F;
}
#gotop:hover{
    background: #FFA54F;
    color: #fff;
}
#gotop:hover .icon{
    color:#fff;
}