.navbar-vertical.navbar-expand-xs .navbar-collapse {
  height: calc(100vh - 160px);
}
.link-image-square{
  height: 200px;
  width: 200px;
  display: flex !important;
  align-items: center;
  margin: 0 auto;
}
.link-image-square img {
  max-width: calc(100% - 30px);
  margin: 0 auto;
}