html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-size: 6vmin;
  font-family: sans-serif;
  background-color: #17c5ff;
  color: #fff;
}

main {
    padding: 5% 10% 5% 10%;
}

a {
    color: #fff;
}

a.button {
    display: block;    
    background: rgba(0,0,0,0.5);
    padding: 0.5em 0.8em;
    margin: 2em 0;
    border-radius: 4px;
    text-decoration: none;
    text-align: center;
}

section {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;    
  display: none;  
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
section.active {
    display: flex;
}

button {
    color: #fff;
    border: none;
    font-size: 1.2em;
    background: rgba(0,0,0,0.5);
    padding: 0.4em 0.8em;
    border-radius: 4px;
    margin: 0.5em;
    text-transform: uppercase;
}

svg {
    max-height: 10vh;
}