*{margin: 0;padding: 0;}
.box{
    width: 100vw;
    height: 100vh;
    position: relative;
}
.header{
    width: 80%;
    height: 80px;
    position: fixed;
    background: rgba(0,0,0,0);
    left: 10%;
    z-index: 1;
    display: flex;
    justify-content: flex-start;
    align-items: center;
}
.header .logo{
    width: 50px;
    height: auto;
}
.header .title{
    float: left;
    line-height: 80px;
    margin-left: 20px;
    color: #fff;
    font-size: 30px;
    font-weight: 600;
}
.header .news_item{
    color: #fff;
    font-size: 16px;
    padding: 4px;
    cursor: pointer;
    margin-left: 40px;
}
.header .news_item:hover{
    color: red;
}
.header .border{
    border-bottom: 4px solid #fff;
}
.slogan{
    width: 100%;
    height: 100vh;
    position: absolute;
}
.txt{
    color: #fff;
    font-size: 16px;
    width: 80%;
    height: auto;
    margin: 0 auto;
    position: absolute;
    bottom:10%;
    left: 50%;
    margin-left: -40%;
}
.qrcode{
    width: 200px;
    height: 200px;
    position: absolute;
    right: 10%;
    top: 10%;
}