body {
  margin-bottom: 90px;
}
html {
  position: relative;
  min-height: 100%;
}
.footer {
  position: absolute;
  bottom: 0;
  width: 100%;
  height: 90px;
  background-color: #f5f5f5;
}
.text-muted {
  margin: 20px;
}