Meu Menu de navegação não flutua com a imagem superior

CSS

body{
    font-family: "Crimson Text", "Times New Roman", serif;
    background-color: #F2FFFC;
    font-size: 120%;
    line-height: 1.5;
}

main a{
    color: #851944;
}

main{
    float: left;
    width: 85%;
}

aside a{
    color: inherit;
    font-family: "Open Sans Condensed", "Arial", sans-serif;
    text-decoration: none;
}

li{
 list-style-type: none;
}

h1, h2{
    font-family: "Open Sans Condensed", "Arial", sans-serif;
}

h1{
    text-transform: uppercase;
}

h2{
    font-size: 30px;
    clear: both;
}

main h1{
    background-color: #851944;
    text-align: center;
    color: #FFF;
    padding: 0px 25px;
    margin: 0px;
    border-bottom: 10px solid #000000;
    font-size: 60px;
}

p{
    text-align: justify;
    margin: 20px 0px;
}

blockquote, aside, footer{
    padding: 20px 40px;
}

.citacao{
    background-color: #D9E5E3;
    border: 10px #C2CCCA solid;
    width: 250px;
    box-sizing: border-box;
    margin: 0px;
}

cite{
    float: right;
    font-size: 15px;
    font-style: italic;
}

.navegacao-site{
    background-color: #3C1D3D;
    color: #F2FFFC;
    padding: 20px;
    text-align: center;
    border-top: 0px;    
    float: right;
    clear: both;
}

img{

    float: right;
    width: 15%;
}

img, .navegacao-site{
    box-sizing: border-box;
    border: 10px solid #000000;
}   

.icones-sociais li{
    display: inline-block;
}

.icones-sociais a{
    color: transparent;
    display: inline-block;
    width: 40px;
    height: 40px;
}
aside h1{
    font-size: 30px;
    margin-bottom: 25px;
}

nav a{
    color: #F2FFFC;
    text-transform: lowercase;

}

#rodape{
    background-color: #000000;
    color: #F2FFFC;
    clear: both;
}

main div{
    width: 720px;
    margin: auto;
    padding: 30px 0px;
}

strong{
    font-weight: bold;
}

em{
    font-style: italic;
}

.artigo{
    padding-bottom: 10px;
    border-bottom: 1px solid #ccc;
    margin-bottom: 20px;
}

.leia-mais{
    font-size: 24px;
    padding: 8px;
    margin: 16px;
    text-align: center;
    background-color: #ccc;
    display: block;
}

.github{
    background-image: url(github.png);
}

.twitter{
 background-image: url(twitter.png);
}

.linkedin{
 background-image: url(linkedin.png);
}

.fiat{
    float: right;
    margin-left: 20px;
}
.petrobras{
    margin-right: 20px; 
 float: left;
}

HTML:

  <img src="eu.jpg" alt="Foto do João da Silva">
<aside class="navegacao-site">
        <h1>João da Silva</h1>
        <nav>
            <ul>
                <li><a href="index.html">Home</a></li>
                <li><a href="portifolio.html">Portifólio</a></li>
                <li><a href="bio.html">Sobre mim</a></li>
                <li><a href="blog.html">Blog</a></li>
                <li><a href="contato.html">Contato</a></li>
            </ul>
        </nav>
        <ul class="icones-sociais">
            <li><a class="github" href="https://github.com/git-joaodasilva">Github</a></li>
            <li><a class="twitter" href="https://twitter.com/twitter-joaodasilva">Twitter</a></li>
            <li><a class="linkedin" href="https://br.linkedin.com/pub/linkedin-joao-da-silva/32/4/508">Linkedin</a></li>
        </ul>
    </aside>