Menu de navegação com dimensões erradas

Pessoal, eu não estou conseguindo encontrar o erro que faz com que meu menu de navegação fique muito maior do que o texto quando eu o coloco na pagina superior direita da página, segue o código e o print do que esta acontecendo. https://ibb.co/yWdR5RL

main h1 {
    font-size: 60px;
    background-color: #851944;
    text-align: center;
    font-family: "Open Sans Condensed", sans-serif;
    color:#FFFFFF;
    padding: 25px;
    margin: 0px;
    border-bottom: 10px solid black;
    text-transform: uppercase;
}
h2 {
    font-size: 30px;
    font-family: "Open Sans Condensed", sans-serif;
    text-align: center;
    clear: both;
}
body {
    background-color: #F2FFFC;
    font-family: "Crimson Text", serif;
    font-size: 120%;
}
p {
    text-align: justify;
    margin: 20px;
    margin-top: 20px;
    margin-bottom: 20px;
}
blockquote {
    background-color: #D9E5E3;
    padding: 16px;
    border: 10px solid #C2CCCA;
    width: 250px;
    margin: 0px;
    box-sizing: border-box;
    margin-left: 40px;
    margin-right: 40px;
    border-bottom-color: #333;
    border-right-color: #FFF;
    margin-top: 20px;
    margin-bottom: 20px;


}

li {
    color:#F2FFFC;
    background-color: #3C1D3D;
    /*padding: 20px;*/
    margin: 0px;
    margin-left: 0px;
    margin-right: auto;
}

footer{

    color: #000000;
    margin: 0px;
    padding: 10px;
    box-sizing: border-box;
    text-align: justify;
    clear: both;


}

#rodape-pagina {
    background-color: #000000;
    color: #F2FFFC;
    padding: 20px;
    margin: 0px;

}

ul {
    color: pink;
    text-decoration: none;
    list-style-type: none;

}

ul li a {
    color: inherit;
}

body a {
    color: #851944;
    font-family: "Open Sans Condensed", sans-serif;
    text-decoration: none;

}
div {
    width: 720px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.5;
    margin-bottom: 30px;
    margin-top: 30px;
}
aside {
    text-align: center;
    background-color: #3C1D3D;
    color: #F2FFFC;
    font-family: "Open Sans Condensed", sans-serif;

}

h1{
    font-size: 30px;
    text-transform: uppercase;
}

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

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

article {
    padding-bottom: 30px;
    border-bottom: 1px solid #ccc;
    margin-bottom: 20px;
}

.leia-mais{
    font-size: 24px;
    padding: 8px;
    margin: 16px;
    display: block;
    text-align: center;
    background-color: #E6E7E8;
}

.icones-sociais a{
    width: 40px;
    height: 40px;
    display: inline-block;
    text-indent: -99999px   ;
}

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

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

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

nav a{
    text-transform: lowercase;
}

.fiat{
    float: right
}

.petrobras{
    float: left
}

aside, img{
    float: right;
    width: 15%;
    float: right;
    width: 15%;
    box-sizing: border-box;
    border-left: 10px solid black;
    border-bottom: 10px solid black;
}

aside{
    clear: right;
    box-sizing: border-box;
}
main{
    float: left;
    width: 85%;
}