* {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
}

h1 {
  font-size: 34px;
}

h2 {
  font-size: 20px;
}

header {
  align-items: center;
  background: salmon;
  display: flex;
  height: 100px;
  justify-content: center;
  margin: 0;
}

aside {
  border: 1px solid #000;
  width: 30%;
}

main {
  border: 1px solid #000;
  padding: 2em;
  width: 70%;
}

footer {
  border: 1px solid #000;
}

.wrapper {
  display: flex;
}

.card {
  background: aliceblue;
  padding: 1em;
  text-align: center;
  width: 50%;
}