html,
body {
  height: 100%;
}

body {
  display: flex;
  flex-direction: column;
}

.content {
  flex: 1 0 auto;
}

.footer {
  flex-shrink: 0;
  min-height: 100px;
  padding-top: 10px;
  background: #2c3e50;
  color: white;
  text-align: center;
}

footer .row {
  margin-top: 10px;
}

.ten-top {
  margin-top: 10px;
}

.twenty-top {
  margin-top: 20px;
}

.center {
  text-align: center;
}

.img-center {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}