html {
    color: #cde;
    font: 16px Tahoma, Consolas, sans-serif;
    text-align: center;
    background: #123; /* fallback */
    background: #257 linear-gradient(#123, #257) repeat-x fixed;
    background-size: 100%; /* fallback */
    background-size: 100vh;
    height: 100%;
}
a { color: inherit; text-decoration: none; }
h1 { font-size: 24px; margin: 0; }
h2 { font-size: 20px; }
h3 { font-size: 18px; margin: 0; padding: 10px 15px; flex: 1; }
img { display: block; max-width: 100%; height: auto; }

/****************************** HEADER ******************************/
header {
    background: url(img/header-bg.jpg) no-repeat center #2ca6cd;
    max-width: 320px;
    margin: auto;
    border-radius: 10px;
    font: bold 24px monospace;
    box-sizing: border-box;
    padding: 10px;
}
header a {
    padding: 5px 15px;
    border-radius: 30px;
    display: inline-block;
    background: rgba(0, 16, 32, 0.75);
    box-shadow: 0 0 10px rgba(0, 16, 32, 0.75);
}
header .divider {
    display: inline-block;
    color: black;
    padding: 5px;
}

/****************************** NAVIGATION ******************************/
nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    max-width: 1600px;
    margin: auto;
}
nav a {
    color: #cde;
    display: flex;
    flex-direction: column;
    border-radius: 15px;
    margin: 15px;
    background: rgba(0, 17, 34, 0.6);
    box-shadow: 0 0 6px #8399c5;
    max-width: 320px;
    overflow: hidden;
}
nav a:hover {
    box-shadow: 0 0 5px 1px #cef;
}
nav a:hover h3 {
    background: linear-gradient(rgba(68, 102, 136, 0.6), rgba(0, 17, 34, 0.6));
}
nav span { display: block; font-size: 14px; opacity: 0.8; }

@media (min-width: 960px) and (max-width: 1600px) {
    nav a { max-width: 20%; margin: 2%; }
}

/****************************** BLOG ******************************/
p + nav {
    display: block;
    text-align: center;
}
p + nav a {
    max-width: 300px;
    margin: 15px auto;
    padding: 10px;
    text-align: left;
    background: linear-gradient(#234, #012);
}
p + nav a:hover {
    background: linear-gradient(#468, #012);
}