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HTML

              
                <div class="container">
    <div class="flags"></div>
</div>
              
            
!

CSS

              
                /*!
 * Generated with CSS Flag Sprite generator (https://www.flag-sprites.com/)
 */

.flag {
    display: inline-block;
    width: 32px;
    height: 32px;
    background: url('https://raw.githubusercontent.com/moT01/FCC-Force-Graph/master/flags.png') no-repeat;
    transition: transform 500ms ease-out 0ms;
  	position: absolute; }

.flag.flag-ca {
    background-position: -96px -64px;
}

.flag.flag-il {
    background-position: -64px -192px;
}

.flag.flag-ba {
    background-position: 0 -32px;
}

.flag.flag-tl {
    background-position: -128px -416px;
}

.flag.flag-lb {
    background-position: -384px -224px;
}

.flag.flag-cn {
    background-position: -384px -64px;
}

.flag.flag-md {
    background-position: -288px -256px;
}

.flag.flag-tr {
    background-position: -256px -416px;
}

.flag.flag-bd {
    background-position: -64px -32px;
}

.flag.flag-bb {
    background-position: -32px -32px;
}

.flag.flag-nl {
    background-position: -96px -320px;
}

.flag.flag-ru {
    background-position: -320px -352px;
}

.flag.flag-tc {
    background-position: -448px -384px;
}

.flag.flag-pa {
    background-position: -288px -320px;
}

.flag.flag-sr {
    background-position: -288px -384px;
}

.flag.flag-so {
    background-position: -256px -384px;
}

.flag.flag-hu {
    background-position: -448px -160px;
}

.flag.flag-bs {
    background-position: -416px -32px;
}

.flag.flag-me {
    background-position: -320px -256px;
}

.flag.flag-de {
    background-position: -128px -96px;
}

.flag.flag-ml {
    background-position: -448px -256px;
}

.flag.flag-ag {
    background-position: -96px 0;
}

.flag.flag-gl {
    background-position: 0 -160px;
}

.flag.flag-je {
    background-position: -352px -192px;
}

.flag.flag-iq {
    background-position: -192px -192px;
}

.flag.flag-dz {
    background-position: -288px -96px;
}

.flag.flag-ki {
    background-position: -96px -224px;
}

.flag.flag-bj {
    background-position: -256px -32px;
}

.flag.flag-gp {
    background-position: -96px -160px;
}

.flag.flag-ar {
    background-position: -288px 0;
}

.flag.flag-jo {
    background-position: -416px -192px;
}

.flag.flag-fo {
    background-position: -160px -128px;
}

.flag.flag-jp {
    background-position: -448px -192px;
}

.flag.flag-jm {
    background-position: -384px -192px;
}

.flag.flag-zw {
    background-position: -448px -448px;
}

.flag.flag-ps {
    background-position: -64px -352px;
}

.flag.flag-mg {
    background-position: -352px -256px;
}

.flag.flag-no {
    background-position: -128px -320px;
}

.flag.flag-gg {
    background-position: -384px -128px;
}

.flag.flag-kr {
    background-position: -224px -224px;
}

.flag.flag-eg {
    background-position: -384px -96px;
}

.flag.flag-gh {
    background-position: -416px -128px;
}

.flag.flag-th {
    background-position: -64px -416px;
}

.flag.flag-ci {
    background-position: -256px -64px;
}

.flag.flag-ir {
    background-position: -224px -192px;
}

.flag.flag-sd {
    background-position: 0 -384px;
}

.flag.flag-pt {
    background-position: -96px -352px;
}

.flag.flag-aw {
    background-position: -416px 0;
}

.flag.flag-tv {
    background-position: -320px -416px;
}

.flag.flag-gm {
    background-position: -32px -160px;
}

.flag.flag-uy {
    background-position: -32px -448px;
}

.flag.flag-lv {
    background-position: -160px -256px;
}

.flag.flag-to {
    background-position: -224px -416px;
}

.flag.flag-ga {
    background-position: -224px -128px;
}

.flag.flag-vn {
    background-position: -256px -448px;
}

.flag.flag-fm {
    background-position: -128px -128px;
}

.flag.flag-sm {
    background-position: -192px -384px;
}

.flag.flag-pe {
    background-position: -320px -320px;
}

.flag.flag-dk {
    background-position: -192px -96px;
}

.flag.flag-ug {
    background-position: -448px -416px;
}

.flag.flag-np {
    background-position: -160px -320px;
}

.flag.flag-gi {
    background-position: -448px -128px;
}

.flag.flag-as {
    background-position: -320px 0;
}

.flag.flag-gn {
    background-position: -64px -160px;
}

.flag.flag-kg {
    background-position: -32px -224px;
}

.flag.flag-tw {
    background-position: -352px -416px;
}

.flag.flag-cr {
    background-position: -448px -64px;
}

.flag.flag-mm {
    background-position: 0 -288px;
}

.flag.flag-bn {
    background-position: -320px -32px;
}

.flag.flag-mu {
    background-position: -224px -288px;
}

.flag.flag-is {
    background-position: -256px -192px;
}

.flag.flag-ro {
    background-position: -256px -352px;
}

.flag.flag-li {
    background-position: -448px -224px;
}

.flag.flag-tm {
    background-position: -160px -416px;
}

.flag.flag-gu {
    background-position: -224px -160px;
}

.flag.flag-af {
    background-position: -64px 0;
}

.flag.flag-bz {
    background-position: -64px -64px;
}

.flag.flag-rw {
    background-position: -352px -352px;
}

.flag.flag-hk {
    background-position: -320px -160px;
}

.flag.flag-pg {
    background-position: -384px -320px;
}

.flag.flag-si {
    background-position: -96px -384px;
}

.flag.flag-ht {
    background-position: -416px -160px;
}

.flag.flag-ye {
    background-position: -352px -448px;
}

.flag.flag-mx {
    background-position: -320px -288px;
}

.flag.flag-er {
    background-position: -448px -96px;
}

.flag.flag-bm {
    background-position: -288px -32px;
}

.flag.flag-ve {
    background-position: -160px -448px;
}

.flag.flag-pk {
    background-position: -448px -320px;
}

.flag.flag-hr {
    background-position: -384px -160px;
}

.flag.flag-se {
    background-position: -32px -384px;
}

.flag.flag-sn {
    background-position: -224px -384px;
}

.flag.flag-zm {
    background-position: -416px -448px;
}

.flag.flag-ms {
    background-position: -160px -288px;
}

.flag.flag-gd {
    background-position: -288px -128px;
}

.flag.flag-sg {
    background-position: -64px -384px;
}

.flag.flag-au {
    background-position: -384px 0;
}

.flag.flag-tz {
    background-position: -384px -416px;
}

.flag.flag-st {
    background-position: -320px -384px;
}

.flag.flag-tt {
    background-position: -288px -416px;
}

.flag.flag-ck {
    background-position: -288px -64px;
}

.flag.flag-mq {
    background-position: -96px -288px;
}

.flag.flag-cz {
    background-position: -96px -96px;
}

.flag.flag-ai {
    background-position: -128px 0;
}

.flag.flag-om {
    background-position: -256px -320px;
}

.flag.flag-cf {
    background-position: -160px -64px;
}

.flag.flag-kn {
    background-position: -160px -224px;
}

.flag.flag-mk {
    background-position: -416px -256px;
}

.flag.flag-cm {
    background-position: -352px -64px;
}

.flag.flag-it {
    background-position: -288px -192px;
}

.flag.flag-ws {
    background-position: -320px -448px;
}

.flag.flag-cu {
    background-position: 0 -96px;
}

.flag.flag-na {
    background-position: -416px -288px;
}

.flag.flag-sz {
    background-position: -416px -384px;
}

.flag.flag-es {
    background-position: 0 -128px;
}

.flag.flag-cg {
    background-position: -192px -64px;
}

.flag.flag-gq {
    background-position: -128px -160px;
}

.flag.flag-pl {
    background-position: 0 -352px;
}

.flag.flag-bw {
    background-position: 0 -64px;
}

.flag.flag-vi {
    background-position: -224px -448px;
}

.flag.flag-vu {
    background-position: -288px -448px;
}

.flag.flag-by {
    background-position: -32px -64px;
}

.flag.flag-rs {
    background-position: -288px -352px;
}

.flag.flag-pw {
    background-position: -128px -352px;
}

.flag.flag-lk {
    background-position: 0 -256px;
}

.flag.flag-ec {
    background-position: -320px -96px;
}

.flag.flag-kz {
    background-position: -320px -224px;
}

.flag.flag-gb {
    background-position: -256px -128px;
}

.flag.flag-kp {
    background-position: -192px -224px;
}

.flag.flag-be {
    background-position: -96px -32px;
}

.flag.flag-py {
    background-position: -160px -352px;
}

.flag.flag-fr {
    background-position: -192px -128px;
}

.flag.flag-nc {
    background-position: -448px -288px;
}

.flag.flag-ee {
    background-position: -352px -96px;
}

.flag.flag-lc {
    background-position: -416px -224px;
}

.flag.flag-za {
    background-position: -384px -448px;
}

.flag.flag-pr {
    background-position: -32px -352px;
}

.flag.flag-im {
    background-position: -128px -192px;
}

.flag.flag-ke {
    background-position: 0 -224px;
}

.flag.flag-kh {
    background-position: -64px -224px;
}

.flag.flag-ae {
    background-position: -32px 0;
}

.flag.flag-qa {
    background-position: -192px -352px;
}

.flag.flag-az {
    background-position: -448px 0;
}

.flag.flag-cl {
    background-position: -320px -64px;
}

.flag.flag-bf {
    background-position: -128px -32px;
}

.flag.flag-nz {
    background-position: -224px -320px;
}

.flag.flag-mv {
    background-position: -256px -288px;
}

.flag.flag-gy {
    background-position: -288px -160px;
}

.flag.flag-mn {
    background-position: -32px -288px;
}

.flag.flag-tn {
    background-position: -192px -416px;
}

.flag.flag-br {
    background-position: -384px -32px;
}

.flag.flag-gw {
    background-position: -256px -160px;
}

.flag.flag-td {
    background-position: 0 -416px;
}

.flag.flag-do {
    background-position: -256px -96px;
}

.flag.flag-id {
    background-position: 0 -192px;
}

.flag.flag-bi {
    background-position: -224px -32px;
}

.flag.flag-vg {
    background-position: -192px -448px;
}

.flag.flag-nr {
    background-position: -192px -320px;
}

.flag.flag-et {
    background-position: -32px -128px;
}

.flag.flag-ls {
    background-position: -64px -256px;
}

.flag.flag-lr {
    background-position: -32px -256px;
}

.flag.flag-ad {
    background-position: 0 0;
}

.flag.flag-km {
    background-position: -128px -224px;
}

.flag.flag-tj {
    background-position: -96px -416px;
}

.flag.flag-sy {
    background-position: -384px -384px;
}

.flag.flag-bg {
    background-position: -160px -32px;
}

.flag.flag-la {
    background-position: -352px -224px;
}

.flag.flag-sk {
    background-position: -128px -384px;
}

.flag.flag-ge {
    background-position: -320px -128px;
}

.flag.flag-sc {
    background-position: -448px -352px;
}

.flag.flag-ne {
    background-position: 0 -320px;
}

.flag.flag-gr {
    background-position: -160px -160px;
}

.flag.flag-eh {
    background-position: -416px -96px;
}

.flag.flag-ly {
    background-position: -192px -256px;
}

.flag.flag-lt {
    background-position: -96px -256px;
}

.flag.flag-mz {
    background-position: -384px -288px;
}

.flag.flag-mc {
    background-position: -256px -256px;
}

.flag.flag-ma {
    background-position: -224px -256px;
}

.flag.flag-bo {
    background-position: -352px -32px;
}

.flag.flag-ky {
    background-position: -288px -224px;
}

.flag.flag-at {
    background-position: -352px 0;
}

.flag.flag-lu {
    background-position: -128px -256px;
}

.flag.flag-ao {
    background-position: -256px 0;
}

.flag.flag-uz {
    background-position: -64px -448px;
}

.flag.flag-re {
    background-position: -224px -352px;
}

.flag.flag-us {
    background-position: 0 -448px;
}

.flag.flag-vc {
    background-position: -128px -448px;
}

.flag.flag-ua {
    background-position: -416px -416px;
}

.flag.flag-ch {
    background-position: -224px -64px;
}

.flag.flag-ng {
    background-position: -32px -320px;
}

.flag.flag-tg {
    background-position: -32px -416px;
}

.flag.flag-sv {
    background-position: -352px -384px;
}

.flag.flag-ie {
    background-position: -32px -192px;
}

.flag.flag-mw {
    background-position: -288px -288px;
}

.flag.flag-fi {
    background-position: -64px -128px;
}

.flag.flag-sl {
    background-position: -160px -384px;
}

.flag.flag-cv {
    background-position: -32px -96px;
}

.flag.flag-my {
    background-position: -352px -288px;
}

.flag.flag-cy {
    background-position: -64px -96px;
}

.flag.flag-co {
    background-position: -416px -64px;
}

.flag.flag-cd {
    background-position: -128px -64px;
}

.flag.flag-am {
    background-position: -192px 0;
}

.flag.flag-pf {
    background-position: -352px -320px;
}

.flag.flag-ni {
    background-position: -64px -320px;
}

.flag.flag-bt {
    background-position: -448px -32px;
}

.flag.flag-sb {
    background-position: -416px -352px;
}

.flag.flag-va {
    background-position: -96px -448px;
}

.flag.flag-bh {
    background-position: -192px -32px;
}

.flag.flag-al {
    background-position: -160px 0;
}

.flag.flag-gt {
    background-position: -192px -160px;
}

.flag.flag-dj {
    background-position: -160px -96px;
}

.flag.flag-sa {
    background-position: -384px -352px;
}

.flag.flag-in {
    background-position: -160px -192px;
}

.flag.flag-dm {
    background-position: -224px -96px;
}

.flag.flag-hn {
    background-position: -352px -160px;
}

.flag.flag-mo {
    background-position: -64px -288px;
}

.flag.flag-mt {
    background-position: -192px -288px;
}

.flag.flag-mr {
    background-position: -128px -288px;
}

.flag.flag-mh {
    background-position: -384px -256px;
}

.flag.flag-ph {
    background-position: -416px -320px;
}

.flag.flag-an {
    background-position: -224px 0;
}

.flag.flag-kw {
    background-position: -256px -224px;
}

.flag.flag-fj {
    background-position: -96px -128px;
}

body {    
    display: -webkit-box;
    display: -moz-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0;
    height: 100vh;
    background-color: #333; }

.link { 
    stroke: #999;
    stroke-width: 1px;  }

.link-active {
    stroke: #fff;
    stroke-width: 2.5px; }

.flags {
    position: absolute; }

.country-label { 
    padding: 15px 5px 5px 50px; }

.main {
    background-color: black;
    color: white;
}

              
            
!

JS

              
                d3.json('https://raw.githubusercontent.com/DealPete/forceDirected/master/countries.json', function (data) {
 
    var width = window.innerWidth-10, height = window.innerHeight-10;

    var links = data.links, nodes = data.nodes;
    var labels = d3.select('.labels');
    var container = d3.select('.container');
    
    var svg = container.append('svg')
        .attr('width', width)
        .attr('height', height)
        .style('background-color', '#333');
    
    var forceSim = d3.forceSimulation(nodes)
        .force("link", d3.forceLink().links(links).strength(2.2))
        .force("charge", d3.forceManyBody().strength(-0.5))
        .force("center", d3.forceCenter(width / 2, height / 2))
        .force('collide', d3.forceCollide(20))
        .on('tick', ticked);
        
    var link = svg.selectAll('.link')
        .data(links)
        .enter().append('line')
        .attr('class', 'link');
    
    var node = container.select('.flags').selectAll('img')
        .data(nodes)
        .enter().append('img')
        .attr('class', (d) => 'flag flag-'+d.code)
        .style('transform', 'scale(0.5)')
        .call(d3.drag()
            .on("start", dragstarted)
            .on("drag", dragged)
            .on("end", dragended));
    
    var linkIndex = {};
    links.forEach(function(d) {
        linkIndex[d.source.index + "," + d.target.index] = 1;
    });
    
    function borders(a, b) {
        return linkIndex[a.index + "," + b.index] || linkIndex[b.index + "," + a.index];
    }
    
    var bordering = d3.select('body').append('div')
        .style('position', 'fixed')
        .style('top', 0)
        .style('left', 0)
        .style('padding', '5px')
        .style('box-shadow', '1px 1px 1px 1px #222')
        .style('color', '#999')
        .style('opacity', 0)
        .style('transition', 'all 500ms ease-out 0ms');
    
    node.on("mouseover", function(d){
        
        var details = "";
        details += '<img class=\"flag flag-'+d.code+'\"/><div class=\"country-label main\">'+d.country+'</div>';
        
        node.style("transform", function(o) {
            if(borders(d, o)) {
                details += '<img class=\"flag flag-'+o.code+'\"/><div class=\"country-label\">'+o.country+'</div>';
                return 'scale(0.8)';
            } else { return 'scale(0.35)'; }
        });
        
        link.classed("link-active", function(o) {
            return o.source === d || o.target === d ? true : false;
        });
        
        d3.select(this).style('transform', 'scale(1.1)')
    
        bordering.html(details)
            .style('opacity', 1);
    }).on("mouseout", function(d){
        bordering.style('opacity', 0)
        link.classed("link-active", false);
        node.style('transform', 'scale(0.5)')
    });
    
    function ticked() {
        link.attr("x1", (d) => d.source.x )
            .attr("y1", (d) => d.source.y )
            .attr("x2", (d) => d.target.x )
            .attr("y2", (d) => d.target.y );
        node.style('left', d => (d.x - 16) + "px")
			.style('top', d => (d.y - 16) + "px");
    }

   function dragstarted(d) {
        if (!d3.event.active) { 
            forceSim.alphaTarget(0.05)
                .restart();
        }
        d.fx = d.x;
        d.fy = d.y;
    }

    function dragged(d) {
        d.fx = d3.event.x;
        d.fy = d3.event.y;
    }

    function dragended(d) {
        if (!d3.event.active) {
            forceSim.alphaTarget(0);
        }
        d.fx = null;
        d.fy = null;
    }
});
              
            
!
999px

Console