#nav-collapse {
  margin-top: 5px;
}
.center-fixed {
    position:fixed;
    display:flex;
    align-items:center;
    justify-content:center;
    top:0px;
    left:0px;
    width:100vw;
    height:100vh;
}

.row.highlight:hover > * {
    background-color: #EEEEEE;
}