<!DOCTYPE html>
<html>
<head>
<title>DRANGDROP2</title>
<meta charset="utf-8">
<style>
html{
background: radial-gradient(#9D2525,#531010);
background-repeat: no-repeat;
}
#contenedor-principal{
width: 450px;
height: 600px;
border: 5px solid #FFF;
margin: auto;
margin-top: 30px;
display: flex;
flex-direction: row;
justify-content: space-around;
align-items: center;
}
#cont_interno{
display: flex;
justify-content: space-around;
align-items: center;
flex-wrap: wrap;
width: 210px;
height: 580px;
background: radial-gradient(#1A278B,#010942);
}
.contint{
width: 200px;
height: 120px;
margin: 25px 0;
background: radial-gradient(#1A278B,#010942);
/*font-size: 25px;
font-family: Verdana;
color: #fff;
text-align: center;*/
}
</style>
<script>
function comenzar(){
var banderas=document.querySelectorAll(".bandera");
for(var i=0;i<4;i++){
banderas[i].addEventListener("dragstart", comienza_arrastrar, false);
}
}
function comienza_arrastrar(event){
event.dataTransfer.setData("text", event.target.getAttribute("id"));
}
function sobre(event){
event.preventDefault();
}
function soltado(event){
event.preventDefault();
var dato=event.dataTransfer.getData("text");
event.target.appendChild(document.getElementById(dato));
}
window.addEventListener("load",comenzar,false);
</script>
</head>
<body>
<div id="contenedor-principal" >
<div id="cont_interno">
<img src="BRA.png" width="190" height="110" class="bandera">
<img src="CAM.png" width="190" height="110" class="bandera">
<img src="CAN.png" width="190" height="110" class="bandera">
<img src="FRA.png" width="190" height="110" class="bandera">
</div>
<div id="caja_contenedores">
<div id="cont_interno1" class="contint" ondrop="soltado(event)" ondragover="sobre(event)"></div>
<div id="cont_interno2" class="contint" ondrop="soltado(event)" ondragover="sobre(event)"></div>
<div id="cont_interno3" class="contint" ondrop="soltado(event)" ondragover="sobre(event)"></div>
<div id="cont_interno4" class="contint" ondrop="soltado(event)" ondragover="sobre(event)"></div>
</div>
</div>
</body>
</html>