<style type="text/css">
.container {
    background-color: yellow;
    /* border: 5px solid darkred;*/
    /*padding: 20px;*/
    margin: 30px;
}

.box1
{
    background-color: lightgreen;
    height: 100px;
    border: 5px solid darkgreen;
    padding: 20px;
    margin: 40px;
}

.box2
{
    background-color: lightblue;
    height: 100px;
    /*border: 5px solid darkblue;
    padding: 20px;*/
    margin: 50px;
}

.box21
{
    background-color: lightcoral;
    height: 100px;
    /*border: 5px solid darkblue;