:root {
  font-family: "Open Sans", sans-serif;
  font-size: 2vmax;
}

body {
  background-color: #131515;
  background-image: url(../images/bg_1920.jpg);
  background-position: 50% 50%;
  background-repeat: no-repeat;
  background-size: cover;
  color: white;
  height: 100vh;
}

.background-overlay {
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  height: 100%;
  width: 100%;
}

article {
  margin: auto;
  text-align: center;
}

h1 {
  font-size: 3em;
  margin: 0.1rem;
}

.links {
  height: 3rem;
  display: flex;
}

.links a {
  transition-duration: 0.25s;
  transition-property: color, background;
  border-radius: 100%;
  border-style: solid;
  border-width: 0.1rem;
  border-color: white;
  color: inherit;
  display: inline-block;
  font-size: 1.5em;
  height: 2em;
  line-height: 2em;
  margin: auto;
  width: 2em;
}

.links a:hover,
.links a:focus {
  background-color: white;
  color: black;
}