body {
  font-family: sans-serif;
  background-color: #000;
    background-image:url(bg-indice.jpg);
    background-repeat: no-repeat;
    background-position: top left;
    background-size: cover;
}
.logo {max-width: 400px;}

header {
  background-color: #fff;
  padding: 20px;
}

h1 {
  text-align: center;
}

main {
  padding: 20px;
}

ul.lista-indices {
  list-style: none;
  margin: 0;
  padding: 0;
}

ul.lista-indices li {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 10px 20px;
  color: #fff;
}

ul.lista-indices li a {
  color: #fff;
    text-decoration: none;
    text-transform: uppercase;
    font-weight: 700;
    font-size: 20px;
}

footer {
  background-color: #fff;
  padding: 20px;
}

p {
  margin: 0;
}
@media (max-width: 768px) {
    header {
    background-color: #fff;
    padding: 0px;
    margin-left: 0px;
    margin-right: 0px;
}
    ul.lista-indices li a {
    color: #fff;
    text-decoration: none;
    text-transform: uppercase;
    font-weight: 700;
    font-size: 1.2em;
}
    ul.lista-indices li {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 5px 0px;
    color: #fff;
}
    .logo {max-width: 300px;}
}