.centered {
    text-align: center;
}

.nodecontent {
    display: inline-block;
    background-color: DarkTurquoise;
    padding: 10px;
    border-radius: 10px;
    color: white;
}

.nodecontent:hover {
    background-color: MediumSeaGreen;
}

.nodecontent .collapse {
    position: absolute;
    bottom: -15px;
    left: calc(50% - 6px);
    color: #EEEEEE;
    background-color: #CCCCCC;
    border-radius: 6px;
    height: 12px;
    width: 12px;
    font-size: 12px;
    text-align: center;
}