style.css

* {
  margin: 0;
  padding: 0;
  position: relative;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

body {
  color: black;
  font-family: Arial, Helvetica, sans-serif;
  background: #222;
}

a {
  color: #C0392B;
}

a:hover {
  color: #222;
}

span {
  font-size: .8em;
}

.container {
  width: 30em;
  height: auto;
  padding: 1.5em;
  margin: 0 auto;
  background: #f1f1f1;
  -webkit-box-shadow: 0 0 5px rgba(0, 0, 0, 0.4);
  -moz-box-shadow: 0 0 5px rgba(0, 0, 0, 0.4);
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.4);
}

nav ul {
  display: block;
}
nav ul li {
  display: inline;
  padding: .5em;
}

article {
  margin: 1.5em 0;
}

/*
 * GitHub Ribbon (by Tim Pietrusky)
 * http://codepen.io/TimPietrusky/pen/ysqrg
*/

.ribbon.ribbon__alpha, .ribbon.ribbon__beta, .ribbon.ribbon__gamma, .ribbon.ribbon__delta {
  color: #fff;
  box-shadow: 0 0 0 0.75em rgba(255, 255, 255, 0);
  -webkit-transition: color 0.35s ease-in, box-shadow 0.215s ease-out;
  -moz-transition: color 0.35s ease-in, box-shadow 0.215s ease-out;
  -o-transition: color 0.35s ease-in, box-shadow 0.215s ease-out;
  transition: color 0.35s ease-in, box-shadow 0.215s ease-out;
}
.ribbon.ribbon__alpha:hover, .ribbon.ribbon__beta:hover, .ribbon.ribbon__gamma:hover, .ribbon.ribbon__delta:hover {
  background: #fff;
  box-shadow: 0 0 0 0.25em rgba(255, 255, 255, 0.4);
}

.ribbon {
  position: absolute;
  padding: 0.5em;
  font-size: 1.35em;
  text-decoration: none;
}

@media (max-width: 44em) {
  .ribbon {
    font-size: 1em;
  }
}

.ribbon.ribbon--top-left {
  top: 0;
  left: 0.5em;
}

.ribbon.ribbon--top-right {
  top: 0;
  right: 0.5em;
}

.ribbon.ribbon--bottom-left {
  bottom: 0;
  left: 0.5em;
}

.ribbon.ribbon--bottom-right {
  bottom: 0;
  right: 0.5em;
}

.ribbon.ribbon__alpha {
  background: #3498db;
  background: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(0%, #3498db), color-stop(100%, #2980b9));
  background: -webkit-linear-gradient(top, #3498db, #2980b9);
  background: -moz-linear-gradient(top, #3498db, #2980b9);
  background: -o-linear-gradient(top, #3498db, #2980b9);
  background: linear-gradient(top, #3498db, #2980b9);
  background: -webkit-gradient(linear, to bottom, to top, color-stop(0%, #3498db), color-stop(100%, #2980b9));
  background: -webkit-linear-gradient(to bottom, #3498db, #2980b9);
  background: -moz-linear-gradient(to bottom, #3498db, #2980b9);
  background: -o-linear-gradient(to bottom, #3498db, #2980b9);
  background: linear-gradient(to bottom, #3498db, #2980b9);
}

.ribbon.ribbon__alpha:hover {
  color: #3498db;
}

.ribbon.ribbon__beta {
  background: #e74c3c;
  background: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(0%, #e74c3c), color-stop(100%, #c0392b));
  background: -webkit-linear-gradient(top, #e74c3c, #c0392b);
  background: -moz-linear-gradient(top, #e74c3c, #c0392b);
  background: -o-linear-gradient(top, #e74c3c, #c0392b);
  background: linear-gradient(top, #e74c3c, #c0392b);
  background: -webkit-gradient(linear, to bottom, to top, color-stop(0%, #e74c3c), color-stop(100%, #c0392b));
  background: -webkit-linear-gradient(to bottom, #e74c3c, #c0392b);
  background: -moz-linear-gradient(to bottom, #e74c3c, #c0392b);
  background: -o-linear-gradient(to bottom, #e74c3c, #c0392b);
  background: linear-gradient(to bottom, #e74c3c, #c0392b);
}

.ribbon.ribbon__beta:hover {
  color: #e74c3c;
}

.ribbon.ribbon__gamma {
  background: #2ecc71;
  background: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(0%, #2ecc71), color-stop(100%, #27ae60));
  background: -webkit-linear-gradient(top, #2ecc71, #27ae60);
  background: -moz-linear-gradient(top, #2ecc71, #27ae60);
  background: -o-linear-gradient(top, #2ecc71, #27ae60);
  background: linear-gradient(top, #2ecc71, #27ae60);
  background: -webkit-gradient(linear, to bottom, to top, color-stop(0%, #2ecc71), color-stop(100%, #27ae60));
  background: -webkit-linear-gradient(to bottom, #2ecc71, #27ae60);
  background: -moz-linear-gradient(to bottom, #2ecc71, #27ae60);
  background: -o-linear-gradient(to bottom, #2ecc71, #27ae60);
  background: linear-gradient(to bottom, #2ecc71, #27ae60);
}

.ribbon.ribbon__gamma:hover {
  color: #2ecc71;
}

.ribbon.ribbon__delta {
  background: #e67e22;
  background: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(0%, #e67e22), color-stop(100%, #d35400));
  background: -webkit-linear-gradient(top, #e67e22, #d35400);
  background: -moz-linear-gradient(top, #e67e22, #d35400);
  background: -o-linear-gradient(top, #e67e22, #d35400);
  background: linear-gradient(top, #e67e22, #d35400);
  background: -webkit-gradient(linear, to bottom, to top, color-stop(0%, #e67e22), color-stop(100%, #d35400));
  background: -webkit-linear-gradient(to bottom, #e67e22, #d35400);
  background: -moz-linear-gradient(to bottom, #e67e22, #d35400);
  background: -o-linear-gradient(to bottom, #e67e22, #d35400);
  background: linear-gradient(to bottom, #e67e22, #d35400);
}

.ribbon.ribbon__delta:hover {
  color: #e67e22;
}