* {
  max-width: 700px;
  margin: auto;
  font-family: Arial, Helvetica, sans-serif;
}

header {
  text-align: center;
}

a {
  color: black;
}

div {
  border-radius: 5px;
}

.left {
  float: left;
}

.right {
  float: right;
}

#main-footer {
  margin-top: 2%;
  border-top: 3px solid black;
  padding-top: 3px;
  text-align: center;
}