<!DOCTYPE html>
<html>
<head>
<title>Заголовок документа</title>
<style>
#boxes{
content: "";
display: table;
clear: both;
}
div{
float:left;
height:470px;
width:23%;
padding:0 10px;
}
#column1{
background-color: #a1edcc;
}
#column2{
background-color:#a0e9ed;
width:43%;
}
#column3{
background-color:#f497f1;
}
h2{
color: #000000;
text-align:center;
}
</style>
</head>
<body>
<main id="boxes">
<h2>W3docs</h2>
<div id="column1">