Não aparece a linha preta abaixo do box "main h1". Segue o código site.css

body {
    font-family: "Crimson Text", "Times New Roman", serif;
    background-color: #F2FFFC;
    font-size: 120%;
    line-height: 1.5;
}
h1,h2 {
    font-family: "Open Sans Condensed", "Arial", sans-serif;
}
main h1 {
    text-align: center;
    background-color: #851944;
    color: #FFF;
    padding: 30px
}

main h1 {
    border-bottom: 10px #000;
    font-size: 60px
}

}

p {
    text-align: justify;
    margin: 20px 0;
}
blockquote { 
    background-color: #D9E5E3;
    border: 10px solid #C2CCCA;
    width: 250px;
    box-sizing: border-box;
    margin: 20px 40px;

}
aside {
    background-color: #3C1D3D;
    color: #F2FFFC;
    text-align: center;
}
article footer {
    background-color: #F2FFFC;
    color: #000;
}
footer {
    background-color: #000;
    color: #F2FFFC;
}
nav a {
    color: #F2FFFC;
}
main a {
    color: #851944;
}
aside a {
    color: inherit;
    font-family: "Open Sans Condensed", sans-serif;
}

aside h1{
    font-size: 30px;
    margin-bottom: 25px;
}
blockquote, aside, footer {
    padding: 20px

}
div {
    width: 720px;
    margin-left: auto;
    margin-right: auto;
}
h2 {
    font-size: 30px;
}
main div {
    padding: 30px 0;
}
strong {
    font-weight: bold;
}
em {
    font-style: italic;
}
aside li {
    display: inline-block;
}