body{
  background-color: maroon;
  color: white;
  font-family: arial;
}

header {
  margin-bottom: 50px;
  text-align: center;
}
header h1 {
  background-color: #fff;
  color: black;
  border: black dashed 6px;
  margin-bottom: 15px;
}
header span {
  font-size: 18px;
  border: black solid 4px;
  color: black;
  background-color: white;
  padding: 3px;
  display: inline-block;
}
header span em {
  font-weight: bold;
}

/* CONTEÚDO PRINCIPAL: */
main {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  align-content: center;
  text-align: center;
}
/* Contâiner Dado: */
.containerDado {
  background-color: black;
  border: white dashed 6px;
  margin-bottom: 40px;
  padding: 0 16px;
  width: 70%;
  /* Display: */
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  align-content: center;
}
.containerDado h2{
  margin: 10px 0;
  background-color: white;
  color: black;
  padding: 0 5px;
}
.containerDado button {
  padding: 12px;
  font-size: 18px;
  margin-bottom: 10px;
}
.containerDado .fotoDado {
  max-width: 150px;
  text-align: center;
  margin: 10px 0;
}
.containerDado .mensagem {
  font-style: italic;
  padding: 5px;
  margin: 0 0 10px 0;
}
.containerDado .ultimoValor {
  margin: 0 0 10px 0;
}

/* OCULTAR ELEMENTOS: */
.oculto {
  visibility: hidden;
  position: absolute;
}

/* MEDIA QUERY: */
@media (min-width: 500px) {
  body {
    margin-left: 20%;
    margin-right: 20%;
  }
  header h1 {
    margin-left: 23%;
    margin-right: 23%;
  }
}