body {
  font-family: Arial, sans-serif;
  background-image: url(taustakuva.jpg);
}

.kaikki {
  background-color: #fff;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.header {
  padding: 30px;
  font-size: 50px;
  letter-spacing: 6px;
  background-image: url(galaxy.jpg);
  color: #fff;
}

.nav {
  background-color: #eef;
  padding: 12px;
}
.nav a {
  margin: 6px;
  color: #???;
}

.main {
  padding: 40px;
}

.footer {
  background-color: #000;
  color: #fff;
}

h2 {
  margin-top: 35px;
}

.header, .nav, .footer {
  text-align: center;
}

img {
  max-width: 100%;
}
.tumma {
  background-color: #555;
  padding: 10px;
}

th, td {
  border: #000 solid 1px;
}

table {
  border-collapse: collapse;
  background-color: #;
}

th {
  background-color: #000;
  color: #fff;
}