html, body {
	font-family: Arial, sans-serif;
	margin: 0;
  background-color: rgb(0, 0, 0);
  height: 100%;
  background-image : url("fundo_cibero.jpg");
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center center;
  padding: 0;
}

header {
	background-color: rgb(51, 51, 51);
	color: white;
  display: flex;
  align-items: center;
  justify-content: center;  
  border-bottom: 5px solid rgb(110, 110, 110);
  height: 10%;
}

main {
  width: 100%;
  height: 85%;
  margin: 0;
  overflow-y: auto; 
}

h1 {
	font-size: 36px;
	margin: 0;
}

h2 {
	font-size: 24px;
	margin: 0;
}

.secao-central {
  width: 50%;
  margin: 0 auto;
  padding: 5% 0;
}

.texto {
  color: white;
  width: 45%;
}

.imagem-cibero {
  border-radius: 50%;
  border: 0.3em solid rgb(92, 92, 92);
  width: 15%;
  height: auto;
}

.imagem-icones {
  width: 5%;
  height: auto;
}

.header-image {
  display:block;
  height: 70%;
  width: auto;
}
footer a {
    color: #272727;
    text-decoration: none;
}
footer span.alt-titles {
  position: absolute;
  bottom: 1px;
  width: 100%;
  height: 5%;
  background-color: rgb(165, 165, 165);
  text-align: center;
  color: #272727;
  display: flex;
  align-items: center;
  justify-content: center; 
}
footer span.tool-icons {
    display: inline;
    vertical-align: middle;
    margin-right: 0.5rem;
}
footer span.tool-identifier {
    font-size: 0.9rem;
}
footer span.alt-titles > span.tool-icons > span.cc-icon > svg {
    height: 0.7rem;
    width: 0.7rem;
}

  @media screen and (max-width: 685px) {
    body {
      background-image : url("fundo_cibero_685.jpg");
    }

    .imagem-cibero {
      border-radius: 50%;
      border: 0.3em solid rgb(92, 92, 92);
      width: 25%;
      height: auto;
    }
    
    .imagem-icones {
      width: 10%;
      height: auto;
    } 
  
    .secao-central {
      width: 90%;
      margin: 0 auto;
      padding: 5% 0;
    }
    
    .texto {
      color: white;
      width: 100%;
    }
  }