styles.css

@import "https://fonts.googleapis.com/css?family=Roboto:300,400,500";

body {
  margin: 0 auto;
  max-width: 50em;
  font-family: "Roboto", "Helvetica", "Arial", sans-serif;
  line-height: 1.5;
  padding: 0 1em;
  color: #555;
}

h2 {
  margin-top: 1em;
  padding-top: 1em;
}

h1,
h2,
strong {
  color: #333;
}

a {
  color: #e81c4f;
}

header {
  background-color: #263d36;
  background-image: url("header.jpg");
  background-position: center top;
  background-repeat: no-repeat;
  background-size: cover;
  line-height: 1.2;
  padding: 10vw 2em;
  text-align: center;
}

header img {
  display: inline-block;
  height: 120px;
  vertical-align: top;
  width: 120px;
}

header h1 {
  color: white;
  font-size: 2.5em;
  font-weight: 300;
  background: rgb(0, 0, 0); /* fallback color */
  background: rgba(0, 0, 0, 0.7);
}

header a {
  border: 1px solid #e81c4f;
  border-radius: 290486px;
  color: white;
  font-size: 0.6em;
  letter-spacing: 0.2em;
  padding: 1em 2em;
  text-transform: uppercase;
  text-decoration: none;
  transition: none 200ms ease-out;
  transition-property: color, background;
}

header a:hover {
  background: #e81c4f;
  color: white;
}

div {
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
  transition: 0.3s;
  padding: 10px;
  margin: 10px;
}
div:hover {
  box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.2);
}

nav ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
}

nav li {
  float: left;
}

nav li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

nav li a:hover {
  background-color: #111;
}

.active {
  background-color: #4caf50;
}