@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap');

html, body {
  font-family: 'Roboto', sans-serif;
  font-size: 16px;
  background-color: black;
  color: #f1f1f1;
  margin: 0;
  padding: 0;
}
header {
  /*display: none;*/
  background-color: #414141;
  padding: 20px 40px;
  box-shadow: 0 10px 10px rgba(0, 255, 0, 0.3);
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
}
header > h1 {
  text-shadow: 2px 3px 10px rgba(0, 255, 0, 0.7);
}

header a {
  color: #00ff00;
  text-decoration: none;
}

header a:hover {
  color: #00ffff;
}

header a:active {
  color: #ffff00;
}

main {
  margin: 300px 40px 40px 40px;
}

div[data-colunas="grid"] {
  display: grid;
  grid-template-columns: auto auto auto;
}