.qingli{
    width: 100%;
    height: 30px;
    color: #fff;
    margin: auto;
    text-align: center;
    font-size: 1.5vw;
    background-color: #000;
    border-radius: 10px;
}
.guan{
    position: absolute;
    right: 30px;
    top: -78px;
    color: yellow;
    font-size:18px;
    background-color: coral;
    border-radius: 30px;
    width: 150px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    font-weight: bold;
}
.guan:hover{
    background-color: red;
}

.navigation{
    display: flex;
    flex-direction: row;
    border:2px rgb(243, 232, 232) solid;
    width: 100%;
    height: 60px;
    border-radius: 10px;
}
.navigation .tree{
    margin: 9px 5px auto;
}
.navigation .tree a{
    width: 70px;
    display: block;
    height: 40px;
    color: aliceblue;
    border: 2px #fff solid;
    margin: 5px 5px auto;
    margin: auto;
    text-align: center;
    line-height: 40px;
    border-radius: 10px;
    font-size: 14px;
    transition: 1s;
}
.navigation .tree a:hover{
    color: red; text-indent: 5px;
    border:2px rgb(231, 190, 77) solid;
}
.marquee{
    text-align: center;
    color: rgb(243, 198, 100);
    line-height: 40px;
    font-weight: bold;
    font-size: 18px;
}
@media screen and (max-width: 763px){
    .tree-a{
        display: none;
    }}