JSFiddle - React, Tailwind, and code Playground

JavaScript

var x=0,y=0;//Here are the given X and Y, you can change them
var idClosest;//Id of the nearest anchor
var smallestIndex;
var couplesXY=[];
var allAnchors;
var html=document.getElementsByTagName("html")[0];
html.style.width="3000px";//You can change 3000, it's to make the possibility of horizontal scroll
html.style.height="3000px";//Here too

function random(min,max)
{
    var nb=min+(max+1-min)*Math.random();
    return Math.floor(nb);
}
function left(obj)//A remixed function of this site http://www.quirksmode.org/js/findpos.html
{
    if(obj.style.position=="absolute")return parseInt(obj.style.left);
    var posX=0;
    if(!obj.offsetParent)return;
    do posX+=obj.offsetLeft;
    while(obj=obj.offsetParent);
    return posX;
}
function top(obj)
{
    if(obj.style.position=="absolute")return parseInt(obj.style.top);
    var posY=0;
    if(!obj.offsetParent)return;
    do posY+=obj.offsetTop;
    while(obj=obj.offsetParent);
    return posY;
}

function generateRandomAnchors()//Just for the exemple, you can delete the function if you have already anchors
{
    for(var a=0;a<50;a++)//You can change 50
    {
        var anchor=document.createElement("a");
        anchor.style.position="absolute";
        anchor.style.width=random(0,100)+"px";//You can change 100
        anchor.style.height=random(0,100)+"px";//You can change 100
        anchor.style.left=random(0,3000-parseInt(anchor.style.width))+"px";//If you changed 3000 from
        anchor.style.top=random(0,3000-parseInt(anchor.style.height))+"px";//the top, change it here
        anchor.style.backgroundColor="black";
        anchor.id="Anchor"+a;
        document.body.appendChild(anchor);
    }
}
function getAllAnchors()
{
    allAnchors=document.getElementsByTagName("a");
    for(var a=0;a<allAnchors.length;a++)
    {
        couplesXY[a]=[];
        couplesXY[a][0]=left(allAnchors[a]);
        couplesXY[a][1]=top(allAnchors[a]);
    }
}
function findClosestAnchor()
{
    var distances=[];
    for(var...