* {
    box-sizing: border-box;
}

body {
    font-family: sans-serif;
    color: #505050;
    padding: 0;
    margin: 0;
}

.container {
    max-width: 800px;
    margin: auto;
}

.top-nav {
    background: #303030;
}

.top-menu.right-menu {
    float: right;
}

.top-menu.left-menu {
    float: left;
}

.top-nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    display: block;
}

.top-nav ul::after, .top-nav::after {
    content: '-';
    color: transparent;
    height: 0;
    width: 100%;
    clear: both;
    display: block;
}

.top-nav li {
    display: inline-block;
    clear: none;
}

.top-menu a {
    display: block;
    padding: 1rem;
    text-decoration: none;
    color: #c0c0c0;
    background: rgba(255,255, 255, 0.05);
    transition: all 350ms;
}

.top-menu a:hover {
    color: white;
    background: rgba(255,255, 255, 0.15);
}

main {
    min-height: 60vh;
}

footer {
    background: #f0f0f0;
    padding: 2rem;
}