body {
    margin: 0;
}

.videoWrapper {
    position: relative;
    flex-grow: 1;
    /*width: 100%;*/
    /*height: 100vh;*/
}

.videoWrapper video {
    top: 0;
    left: 0;
    max-width: 100%;
    max-height: 75vh;
    height: calc(55%);
}

main {
    max-width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    
}

.fooder {
    width: 100%;
    position: fixed;
    display: flex;
    align-items: center;
    justify-content: center;
    bottom: 0px;
    min-height: 20px;
    padding: 10px;
    flex-wrap: wrap;
}

.header {
    width: 100%;
    min-height: 3.6em;
    background-color: #209CEE;
    display: flex;
    flex-direction: row;
}
.menu {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    width: 100%;
    flex-wrap: wrap;
}
.menu-item {
    margin: 3px 10px;
    padding: 10px;
    border: 1.5px solid #3e8e41;
    border-radius:5px;
}

.menu-item:hover {
    background-color: #3e8e41; /* 鼠标滑过时的背景颜色 */
}

.menu-link {
    text-decoration: none;
}
a:link { 
/* font-size: 12px;  */
    color: #000000; 
    text-decoration: none; 
} 
a:visited { 
/* font-size: 12px;  */
    color: #000000; 
    text-decoration: none; 
} 
a:hover { 
/* font-size: 12px;  */
    color: #000000; 
    text-decoration: none; 
} 

#tip{
    display:flex; position:fixed;  right: 10px; top: 100px; background-color: #209CEE; padding: 10px; margin: 10px; max-width: 200px; flex-direction: column; z-index: 100;
}

@media screen and (max-width: 768px){
    #tip{
        display: none;
    }
}