html {
  background-image: linear-gradient(#e6f0a3 0%, #d2e638 50%, #c3d825 51%, #dbf043 100%);
  min-height: 100%;
}

body {
  font: 20px Helvetica, sans-serif;
  padding: 2.5% 0;
}


article {
  margin: 0 auto;
  max-width: 95%;
}

h1, h2 {
    display: none;
}

nav a {
    background: rgba(255, 255, 255, 0.8);
    width: 110px;
    height: 100px;
    display: inline-block;
    padding: 15px 0;
    margin: 0px 5px 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    text-align: center;
    vertical-align: top;
    position: relative;
}


@media only screen and (min-width: 768px) {
    nav {
        margin-left: 110px;
        position: relative;
    }

    nav .main {
        position: absolute;
        left: -130px;
    }
}

nav img {
    margin: auto;
    max-width: 90%;
    max-height: 70%;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}

a {
  text-decoration: none;
  color: inherit;
}

nav a:hover {
    background: rgba(240, 240, 240, 0.8);
}

nav a:active {
    background: rgba(220, 220, 220, 0.8);
}


nav a>.fa, nav a>.fa-stack{
    width: 100%;
    margin-top: .25em;
    margin-bottom: .35em;
    font-size: 32px;
}

nav a span {
    display: block;
    margin-top: .55em;
    font-weight: 400;
    line-height: 1.1;
}