html,
body,
div,
img,
span,
ul,
li,
ol,
a,
p {
    margin: 0px;
    padding: 0px;
}

body {
    background-color: white;
}

.title {
    font-size: 2.5em;
    color: #2b3959;
}

a:active {
    color: white;
}

.btns div {
    padding: 7px 0;
}

.btns div:hover {
    background-color: #5D6F9D;
}

.btns div:hover a {
    color: white;
}

.btns a {
    display: inline-block;
    text-decoration: none;
    color: #5D6F9D;
    padding: 0px 10px;
}

.box {
    width: 71%;
    margin: 0 auto;
    display: flex;
    width: 100%;
}

.left {
    width: 17%;
}

.middle {
    width: 66%;
}

.right {
    width: 17%;
}

.nav {
    width: 15%;
    position: fixed;
    top: 34%;
    right: 1.5%;
}

.img_box img {
    display: block;
    width: 100%;
}

.img_box {
    position: relative;
}

.img_box a {
    display: block;
}

.btn0 {
    position: absolute;
    top: 0%;
    left: 0%;
    width: 100%;
    height: 100%;
}

.btn1 {
    position: absolute;
    top: 37.5%;
    left: 28%;
    width: 17%;
    height: 3%;
}

.kjzzszyfp {
    position: absolute;
    top: 33%;
    left: 8%;
    width: 32%;
    height: 5%;
}

.btn2 {
    position: absolute;
    top: 38%;
    left: 25%;
    width: 14%;
    height: 3%;
}

.btn3 {
    position: absolute;
    top: 23.5%;
    left: 24%;
    width: 14%;
    height: 3%;
}

.btn4 {
    position: absolute;
    top: 17%;
    left: 26%;
    width: 14%;
    height: 2%;
}

.btn42 {
    position: absolute;
    top: 17%;
    right: 10%;
    width: 14%;
    height: 2%;
}

.btn5 {
    position: absolute;
    top: 5.5%;
    left: 23%;
    width: 10%;
    height: 2%;
}

.btn52 {
    position: absolute;
    top: 5.5%;
    right: 13%;
    width: 10%;
    height: 2%;
}

.btn53 {
    position: absolute;
    bottom: 21%;
    left: 22%;
    width: 11%;
    height: 2%;
}

.btn6 {
    position: absolute;
    top: 13%;
    left: 28%;
    width: 45%;
    height: 33%;
}

.xuan {
    font-size: 1.2em;
    font-weight: 600;
    color: #2b3859;
    border-left: 3px solid #2b3859;
}

.video_mp4 {
    /* position: absolute;
    top: 0%;
    left: 0%; */
    width: 100%;
    height: 100%;
}

@media screen and (max-width: 900px) {
    .left {
        width: 0%;
    }

    .right {
        width: 20%;
    }

    .middle {
        width: 80%;
    }

    .nav {
        top: 6%;
        width: 18%;
    }

    .n_img {
        width: 100%;
    }

    .n_img img {
        width: 100%;
    }

    .btns {
        font-size: 12px;
    }

    .btns div:hover {
        background-color: white;
    }

    .btns div:hover a {
        color: #2b3859;
    }

    .btns a {
        padding: 0px 5px;
    }

    .btns div {
        padding: 6px 0;
    }
}