html {
    background-color: black;
    background-image: url('http://fc03.deviantart.net/fs70/f/2011/200/8/6/stars_tiled_wallpaper_by_theemerald-d40sql0.jpg');
}

    .page-header {
    background-color: #f40707;
    color: #3920a7;
    padding: 20px;
    
    text-align: center;
  
    } 
    .introduction {
    background-color: #222222;
    padding: 30px;
    width: 700px;
    margin: 0 auto;
    margin-top: 30px;
    width: 700px;
    margin-left: auto;
    margin-right: auto;
    border-radius: 20px;
    margin-top: 30px;
    color: #FFFFFF;
    font-size: 14px;
    line-height: 130%;
}
.page-footer {
    background-color: #222222;
    color: #FFFFFF;
    padding: 20px;
    width: 100%;
    text-align: center;
}
.gallery{
    background-color: #222222;
    padding: 30px;
    width: 700px;
    margin: 0 auto;
    margin-top: 30px;
    text-align:center;    
  
}
.gallery img {
    height: 100px;
    border-width: 5px;
    border-color: #FFFFFF;
    border-style: solid;
    box-shadow: 3px 3px 5px 6px #000000;
    margin: 5px;
}
.videos{
    background-color: #222222;
    padding: 30px;
    width: 700px;
    margin: 0 auto;
    margin-top: 30px;
    text-align:center;  
}


.main-menu a:hover {
    background-color:black;
    color: #FFFFFF;
}

.main-menu a {
    background-color: #3920a7;
    border-color: #00DD00;
    font-weight: bold;
    display: inline-block;
    padding: 5px 10px;
    color:black;
    text-align:center;
}   

.main-menu {
    background: #FF0000;
    text-align: center;
}