* {
  box-sizing: border-box;
}

body, html {
  height: 100%;
}

body {
  background-color: #000;
}

#main {
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 50%;
}

#main .jumbotron {
  padding: 15px;
}

.hero {
  width: 100%;
}


@media (max-width: 768px) {
  #main {
    width: 90%;
  }
}