* {
  padding: 0px;
  margin: 0px;
}

body {
  background-color: rgba(174, 185, 181, 0.683);
  font-family: Arial, Helvetica, sans-serif;
}

nav {
  width: auto;
}

.navega ul {
  list-style: none;
  margin-top: 0;
}

.navega li {
  display: inline;
  float: left;
  width: 100px;
  border-left: #666666 thin solid;
}

a.opcoes {
  display: block;
  text-decoration: none;
  padding: 6px;
  background-color: #CCCCCC;
  font-family: Verdana, Arial, Helvetica, sans-serif;
  font-size: 14px;
  font-weight: bold;
}

.coluna-central {
  justify-content: center;
  align-items: center;
}

#titulo {
  color: brown;
}

#cabeca {
  font-family: Impact, 'Arial Narrow Bold', sans-serif;
  font-size: 60px;
  color: rgba(165, 42, 42, 0.541);
}

.topo {
  justify-content: center;
  align-items: center;
  top: 0.1rem;
  position: relative;
  padding: 0px;
  background-image: url(imagem/topo.jpg);
  width: 100%;
  display: flex;
}

.bloco1 {
  position: relative;
  float: left;
  height: 14vh;
  width: 60%;
  padding: 2%;
  height: 400px;
}

.bloco2 {
  display: flex;
  background-color: rgba(205, 225, 225, 0.516);
  padding: 10px;
}

.bloco3 {
  padding: 10px;
  justify-content: center;
  align-items: center;
}

.video {
  width: 700;
  height: 400;
}

footer {
  position: block;
  float: left;
  width: 100%;
  height: 30%;
  text-align: center;
  font-size: small;
  background-color: rgba(205, 225, 225, 0.516);
}

@media all and (max-width: 768px) {
  i {
    visibility: visible;
  }

  #logo {
    display: none;
  }

  #cabeca {
    font-size: 30px;
  }

  .coluna-central {
    justify-content: center;
    align-items: center;
  }

  .topo {
    font-size: 30px;
  }

  .bloco1 {
    position: block;
    width: 80%;
    height: 80%;
    padding-top: 5%;
  }

  .bloco2 {
    position: block;
    padding-top: 1rem;
    width: 80%;
  }

  .video {
    width: 300;
    height: 100;
  }

  footer {
    position: block;
    bottom: 0;
    width: 100%;
    height: 30%;
  }
}