html {
  font-size: 16px;
  font-family: sans-serif;
  display: flex;
  justify-content: center;
}
#hangman {
  width: 75vw;
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: stretch;
}

#word {
  letter-spacing: 5px;
  font-size: 2rem;
  padding: 30px 20px;
  border: 3px black solid;
  text-align: center;
}

#letters {
  padding: 20px 50px;
}

#letters button {
  width: 40px;
  height: 40px;
  padding: 10px;
  margin: 10px;
}

#output {
  display: flex;
  width: 100%;
  margin-bottom: 30px;
}

#output .step {
  width: calc(100% / 8);
  border-right: 3px #fff solid;
}

#output .step {
  opacity: 0.1;
}

#output .step img {
  width: 100%;
}

#category {
  text-align: center;
  padding: 30px 0px;
  text-transform: uppercase;
}

button.positive {
  border: 2px solid green;
  background-color: rgba(0, 255, 0, 0.3);
}

button.negative {
  border: 2px solid red;
  background-color: rgba(255, 0, 0, 0.3);
}