html {
    background-color: black;
    background-image: url('https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcTTixbOP0kGaLT4i_kRs7Ge53b42a_EZE2tuw4pTizaECdpQNp0');
    color:white;
    text-align:center;
    font-family:sans-serif;
 
}
.page-header {
    background-image: url('https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcTF4PWkedP5_e22sU49uwl4DB0LAtUEsSBHAS5ll_k2aWAjzNYW');
    color: #3CFF2F;
    padding: 20px;
}.page-header {
  font-family: "Comic Sans MS";
  font-size: 25px;
  text-align: center;
  text-shadow: 5px 5px 5px rgba(0,0,0,0.5);
}.gallery {
    background-color: #3CFF2F;
    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;
}
body {
font-size:25px;}
.main-menu {
    background: #3CFF2F;
}
.main-menu a {
    background-color: #00FF00;
    border-color: #00DD00;
    font-weight: bold;
    display: inline-block;
    padding: 5px 10px;
}

.main-menu a:hover {
    background-color: #00DD00;
    color: #FFFFFF;
}