html, body {
  margin: 0;
  padding: 0;
  height: 100vh;
}
body.layout-inicial{
  height: 100vh;
  width: auto;
  margin: 0;
  padding: 0;
  background-image: linear-gradient(
      to top,
      rgba(0, 0, 0, 0.5),
      rgba(0, 0, 0, 0.5)
    ),
    url("images/space2.jpg");

  background-size: cover; /* cobre toda a área */
  background-repeat: no-repeat; /* evita repetição */
  background-position: center center; /* centraliza a imagem */
  background-attachment: fixed;
}
a {
  color: white;
  text-decoration: none;
}
a:hover {
  opacity: 0.7;
}
nav {
  display: flex;
  justify-content: center; /* ou space-around */
  align-items: center;
  background: #23232e;
  height: 8vh;
}

.nav-list {
  list-style: none;
  display: flex; /* <- AQUI é o que faz os <li> ficarem lado a lado */
  padding: 0;
  margin: 0;
}

.nav-list li {
  letter-spacing: 3px;
  margin-left: 32px;
}
#buttonT{
    width: 12vw;
    height:8vh;
    background: orange;
    border:2px solid orange;
    margin-top:10px;
    margin-left: 10px;
    color: white;
    font-size: 1.5vw;
    border-bottom-right-radius: 5px;
    border-bottom-left-radius: 5px;
    border-radius: 10px
    ;
}
#buttonT:focus{
    outline: none;
}

.content{
    width: auto;
    height: auto;
    margin-left: 80px;
    color:white;
    position: relative;
}
.content .par{
    padding-left: 20px;
    padding-bottom: 20px;
    font-family: Arial;
    letter-spacing: 1.2px;
    line-height: 30px;
    font-size: large;
}
.content h1{
    font-family: "Times New Roman", Times, serif;
    font-size: 50px;
    margin-top: 9%;
    padding-left: 20px;
    letter-spacing: 2px;
}
body.layout-inicial #discussion-screen,
body.layout-inicial #jogar-screen,
body.layout-inicial #aprendizado-screen,
body.layout-inicial #matrix-screen,
body.layout-inicial #fim-screen{
  display: none;
}
body.layout-inicial #tela-inicial{
  display: block;
}