.custom-node:hover .port {
    visibility: visible;
}

.custom-node .port {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: #f5f5f5;
    border: 1px solid #d4d4d4;
    cursor: pointer;
    visibility: visible;
}

.custom-node .port:hover, .node > .card .port.has-links {
    visibility: visible;
    background-color: black;
}

.custom-node .port.bottom {
    position: absolute;
    bottom: -10px;
    left: 151px;
}

.custom-node .port.top {
    position: absolute;
    top: -10px;
    left: 151px;
}