* {
  margin: 0;
  padding: 0;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  background-image: url(luxa.org-opacity-changed-fondo.jpeg);
  background-size: cover;
  background-attachment: fixed;
}

.contenedor {
  margin: auto;
  width: 90%;
  max-width: 1000px;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
}

header {
  width: 100%;
  padding: 50px 0;
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
}

header .menu a {
  color: #fff;
  text-decoration: none;
  margin-right: 40px;
  font-size: 18px;
}

header .menu a:hover {
  color: black;
}

.main {
  background: #fff;
  padding: 20px;
  width: 70%;
}
.main article .thumb img {
  width: 100%;
  vertical-align: top;
}

.main article h2 {
  margin-bottom: 20px;
  font-weight: normal;
  font-size: 32p;
}
.main article p {
  margin-bottom: 20px;
  line-height: 27px;
}
aside {
  width: 30%;
  padding: 20px;
  background: rgb(136, 136, 235);
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
  justify-content: space-between;
}
aside .ad {
  font-size: 32px;
  text-align: center;
  color: azure;
  padding: 50px 0;
  background: #4264a2;
}

footer {
  margin-top: 20px;
  background: rgb(222, 222, 226, 0.2);
  padding: 20px;
  width: 100%;
  color: #fff;
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  flex-wrap: wrap;
}
footer .redes a {
  color: #fff;
  text-decoration: underline;
  margin-left: 20px;
}

footer .redes a:hover {
  color: #4264a2;
}

@media screen and (max-width: 800px) {
  .main {
    width: 100%;
  }
  aside {
    width: 100%;
    flex-direction: row;
  }
  aside .ad {
    width: 40%;
  }
}

@media screen and (max-width: 600px) {
  header {
    flex-direction: column;
    padding-bottom: 20px;
  }
  header .menu {
    width: 100%;
    background: rgb(222, 222, 226, 0.2);
    text-align: center;
    padding: 20px;
  }
  header .menu a {
    margin: 0 20px;
  }
  header .logo {
    margin-bottom: 20px;
  }
  footer {
    flex-direction: column;
    text-align: center;
  }
  footer .autor {
    order: 2;
  }
  footer .redes {
    order: 1;
    margin-bottom: 20px;
  }
}

@media screen and (max-width: 400px) {
  aside {
    display: none;
  }
}