* {
  margin: 0;
  padding: 0;
  box-sizing: border-box; /* 统一盒模型 */
}


body {
    width: 100%;
    background-color: rgb(24, 24, 201);




}

.bigbox {
    width: 100%;
    
    flex-flow: row wrap;
    display: -webkit-flex;  /* 兼容旧版 WebKit 内核 */
    display: flex;
  -webkit-flex-direction: row;
      flex-direction: row;
}

.smallbox {
    width: 100%;
    flex: 1;
}

nav {
    background-color: rgb(14, 16, 136);
    font-size: 22px;
    font-weight: 400;
    font-family: 黑体;
    height: 50px;
}

ul {
    width: 600px;
    height: 1000px;

    position: absolute;
    left: 300px;
    top: 250px;

}

li {
    color: wheat;


}

@keyframes blink {
    0% {
        opacity: 1;
    }

    25% {
        opacity: 0.8;
    }

    50% {
        opacity: 0.5;
    }

    75% {
        opacity: 0.8;

    }

    100% {
        opacity: 1;
    }

}

.blink {
    top: 0px;
    animation: blink 1.5s ease 2s infinite;
    animation-duration: 3s;


}


span.class0 {
    position: absolute;
    left: 15%;
    top: 0px;
    color: #f5f7f7;
    font-size: 40px;
    font-family: 思源黑体;
    font-weight: 700;
    font-style: italic;

}

span.class1 {
    color: #49f0f0;
   
    font: 900 35px 思源黑体;
}

span.class2 {
    color: #f5f7f7;
    font: 350 19px 思源黑体;
}

.box1 {background-color: rgb(11, 11, 187);
    position: absolute;
    top: 0px;
    width: 100%;
    height: 50px;
    display: flex;
    flex: auto;
    flex-flow: row wrap;
    justify-content: flex-start;
    margin: 20px 10px;
}



.box1>a[href$="html"] {
    color: #e9ecf5;
    display: block;
    width: 80px;
    height: 25px;
    
    
    text-decoration: none;
    
    

}



.box1 div {
    background-color: rgb(94, 116, 245);
    width: 80px;
    height: 26px;
    font: 400 20px 黑体;
    margin: 20px 10px;
    text-decoration: none;

}

.box1>a:link {
    color: #e9ecf5;
}

.box1>a:visited {
    color: #d3f052;
}

.box1>a:hover {
    color: red;
    transition-property: color;
    transition-duration: 1.5s;
}

.box1>a:active {
    color: rgb(31, 207, 111);
    transition-property: color;
    transition-duration: 0s;
}



a{text-decoration: none;}


span>a {
    color: #49f0f0;
    思源黑体;
    font-weight: 550;
    font-size: 30px;
    text-decoration: none;
}

span>a:link {
    color: #49f0f0;
    思源黑体;
    font-weight: 550;
    font-size: 30px;
}

span>a:visited {
    color: #7cbaec;
    思源黑体;
    font-weight: 550;
    font-size: 30px;
}

span>a:hover {
    color: red;
    transition-property: color;
    transition-duration: 1.5s;
}

span>a:active {
    color: rgb(31, 207, 111);
    transition-property: color;
    transition-duration: 0s;
}

.video1 {

    width: 100%;




}