.introduction {
    text-align: right;
}
.NaviBar{
    width:100%;
    background-color: #333;
    position: absolute;
    /*margin: 0;*/
    top: 0 !important;
    left: 0;
    right: 0;
}
.NaviBar ul {
    width:84%;
    margin:0 8%;
    list-style:none;
    padding: 0;
    overflow: hidden;
    background-color: #333;
}
.NaviBar li {
    display: inline-block;

}
.NaviBar li a {
    display: inline-block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}
.NaviBar li a:hover {
    background-color: #111;
}

.main_img {
    float: left;
    width: 20%;
    height: 30%;
}

#banner {
    width: 25em;
    height: 15em
}

.author_img {
    float: right !important;
    width: 40%;
    height: 80%;
}

.footer {
    margin-top:2em !important;
    background-color: #333;
    height:10em;
    position: absolute;
    bottom: -50em;
    left: 0;
    right: 0;
}

.footer p, hr {
    color: white;
    text-align: center;

}