*{
    margin: 0;
    /*外边距；0；*/
    padding: 0;
     /*内边距；0；*/
}
.container{
    position: relative;
    /*相对定位*/
    height: 100vh;
    /*视口高度*/
    display: flex;
    /*弹性布局*/
    justify-content: center;
    /*水平居中*/
    align-items: center;
    /*垂直居中*/
    overflow: hidden;
}
.video-container{
    position: absolute;
    z-index: -1;
    /*层级*/
}
@font-face {
    /*引用本地字体*/
    font-family: 'myfont';
    /*起名*/
    src: url('../font/font/汉仪行楷简.ttf');
    /*制定路径*/
}
.text-container{
     color: white;
     text-align: center;
     line-height: 55px;
}
.text-container h1{
    letter-spacing: -1px;
    font-family: 'myfont';
    font-size: 40px;
    font-weight: 100;
    /*字体粗细*/
}
h2{
    font-family: Arial, Helvetica, sans-serif;
    /*紫题*/
    font-weight: 100;
    letter-spacing: 6px;
    /*字体间距*/
}
.btn{
    display: inline-block;
    color: white;
    text-decoration: none;
    /*去除a标签的下划线*/
    width: 150px;
    height: 50px;
    border: 1px solid white;
    line-height: 50px;
    margin-top: 30px;
    border-radius: 5px;
    /*导圆角*/
}
.btn:hover{
    /*鼠标悬停变色*/
    background-color: dimgray;
}
.video-container::after{
    /*在某个元素之后加个元素*/
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color:rgba(0, 0, 0, 0.227) ;  
 }
 .nav{
    /*导航*/
    width: 1000px;
    height: 50px;
   /* background-color: rgba(240, 248, 255, 0.103);*/
    position: absolute;
    top: 30px;
 }
 img{
    height: 50px;
    float: left;
    /*浮动*/
 }
 .list{
    float: right;
 }
 .list>li{
    float: left;
    list-style: none;
    color: white;
    margin-right: 30px;
    line-height: 50px;
 }
 .sub-list{
    list-style: none;
    display: none;
 }
 .list a{
    text-decoration: none;
    color: white;
 }
 .list a:hover{
    color: rgb(170, 184, 11);
 }
#product:hover .sub-list{
    display: block;
}
.triangle{
    display: inline-block;
    width: 0;
    height: 0;
    border: 4px solid transparent;
    border-top: 4px solid white;
    top: -2px;
}
#product:hover .triangle{
    border: 4px solid transparent;
    border-bottom: 4px solid white;
    position: relative;
    bottom: -2px;
}
.news{
    width: 100%;
    /*height: 1000px;*/
    background-color: rgb(233, 233, 233);
}
.title{
    max-width:1200px ;
    margin: 0 auto;
    height: 130px;
    /*background-color: aqua;*/
    display: flex;
    justify-content: center;
    align-items:center ;
}
.news-title{
    display: inline-block;
   /* background-color: blue;*/
    text-align: center;
}
.news-container{
    max-width: 1200px;
    /*height: 800px;*/
    margin: 0 auto;
    /*background-color: aquamarine;*/  
    display:flex;
     /*开启弹性盒模型，要写在父元素上*/
    flex-wrap: wrap;
    /*自动换行*/
    justify-content: center;
    /*居中对齐*/
}
.news-item{
    width: 300px;
    height: 300px;
    background-color: white;
    padding: 20px;
    border-radius: 5px;
    margin: 20px;
}
.news-item img{
    width: 300px;
    height: 200px;
    margin-top: 10px;
}
.news-item h3{
    margin-bottom: 10px;
}