.b {
    background-image: url('https://cdn.shopify.com/s/files/1/0806/0141/articles/Fireflies-Feature_9a240cc8-e29a-45ca-b936-90596ff6e20d.jpg?v=1526320164');
    background-size: cover;
    background-position: center;
    height: 100%;
}

div {
    font-family: 'Trebuchet MS', sans-serif;
    font-size: 20px;
    line-height: 2;
    color: royalblue;
    text-align: center;
    margin: 1.5em 400px;
    padding: 0.5em 10px;
  }

html {
    
}

h1{
  font-family: 'Trebuchet MS', sans-serif;
  text-align: center;
  color: blue;
  font-size:100px;
}

.center{
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}