*{
    /* 初始化 */
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    /* 100%窗口高度 */
    min-height: 100vh;   
    /* 渐变背景 */
    background-color: black;
}


header{
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    z-index: 10;
    padding: 20px 100px;
    box-sizing: border-box;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #fff;
    overflow: hidden;
    border-bottom: double white 1px;
    /*border-radius: 30px;*/
    background-color: rgba(0, 0, 0, 0.5);


}
.nav-header{
    display: flex;
    flex-direction:row;
}
.navbar-brand{
    font-family: '宋体';
    font-size: 30px;
    font-weight: bold;
    height: 30px;
    color: #fff;
}

.font-special{
    font-family: '宋体'，'新宋体'，sans-serif;
}
.active{
    background: #497271
}
header ul {
    list-style: none;
    display: flex;
    justify-content: center;
    align-items: center;
}
header ul li{
    font-weight: 400px;
    margin-left: 15px;
    transition: all .5s linear;
    padding: 5px 10px;
    border-radius: 20px;
}
header ul li:hover{
    background: #497271;
    color: #2b1055;
}
a:link,a:visited{
    color: #fff;
    text-decoration: none;
}


.music{
    position: relative;
    margin-left: 80%;
    margin-top: 75px;
    
}



.box1{
    
    border-radius: 30px;
    padding:auto;
    margin: 200px 270px;
    width: 70%;
    height:fit-content;
    line-height: 35px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    font-family: '宋体';
    font-weight: bold;
    font-size: large;
    color: #fff;
    background-color: #497271;
    padding: 20px 20px;
}

p1{
  
    animation-duration: 3s;
    animation-name: slidein; 

}
@keyframes slidein{
    from {
        margin-left: 100%;
        width: 300%;
    }
    to {
        margin-left: 0%;
        width: 200%;
    }
    
}