.center {
    width: 900px;
    margin: 0 auto;
}

.footer {
  position: fixed;
  bottom: 0;
  width: 100%;
  height: 60px; /* Set the fixed height of the footer here */
  line-height: 60px; /* Vertically center the text there */
  background-color: #f5f5f5;
}