html {
  height: 100%;
  overflow: hidden;
}

body {
  background: url(https://i.imgur.com/E0yI8if.jpg);
  background-size: cover;
  font-family: "Cabin Condensed", sans-serif;
}

.container > header {
  color: whitesmoke;
  text-shadow: 2px 2px 10px black;
  text-transform: uppercase;
  font-family: "Anton", sans-serif;
  font-size: 25px;
  letter-spacing: 4px;
}

@media (max-width: 650px) {
  .container > header {
    font-size: 20px;
  }

  @media (max-width: 570px) {
    .container > header {
      font-size: 15px;
      text-align: center;
    }
  }
}

input {
  width: 95%;
  font-weight: bold;
  font-size: 20px;
  background: #272b2e;
  color: whitesmoke;
  padding: 10px;
  margin-top: 10px;
}

.cards {
  color: #322a26;
  font-size: 20px;
  font-weight: bold;
}

.card1,
.card2,
.card3 {
  padding: 5px 20px;
  margin: 20px;
  box-shadow: 2px 2px 15px black;
  color: #272b2e;
}

.card1 {
  margin-bottom: 10px;
  background: #9ca3db;
}

#kgOutput,
#ozOutput,
#gramsOutput {
  text-shadow: 1px 1px 2px black;
  color: whitesmoke;
}

.card2 {
  margin-bottom: 10px;
  background: #677db7;
}

.card3 {
  background: #546a76;
}

footer {
  display: flex;
  justify-content: center;
}

footer h4 a {
  color: navy;
}

#output {
  opacity: 0.7;
}