jest taki kod, przeszukałem forum, googla, ale znajduję tylko szczątkowe odpowiedzi.
<html lang="en">
<head>
<title>CSS Website Layout</title>
<meta charset="utf-8">
<style>
* {
box-sizing: border-box;
}
body, table, tbody, tr, td, p, ul, ol, li {
font-family : Tahoma, "DejaVu Sans";
font-size : 12px;
margin: 0;
padding: 0;
}
.column {
float: left;
padding: 0px;
margin: 0px;
}
.column.side {
width: 18%;
border-left: 1px solid blue;
border-right: 1px solid blue;
height: auto;
}
.column.middle {
width: 64%;
border-left: 1px solid red;
border-right: 1px solid red;
height: auto;
}
.row {
margin-top: 0%;
margin-left: 2%;
margin-right: 2%;
margin-bottom: 0%;
border-top: 3px solid black;
}
.row:after {
content: "";
display: table;
clear: both;
}
<!--
</style>
</head>
<body>
<div class="row">
<div class="column side">
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.. Lorem ipsum dolor sit amet, consectetur adipiscing elit..
Lorem ipsum dolor sit amet, consectetur adipiscing elit.. Lorem ipsum dolor sit amet, consectetur adipiscing elit..
Lorem ipsum dolor sit amet, consectetur adipiscing elit.. Lorem ipsum dolor sit amet, consectetur adipiscing elit..
Lorem ipsum dolor sit amet, consectetur adipiscing elit.. Lorem ipsum dolor sit amet, consectetur adipiscing elit..
</p>
</div>
<div class="column middle">
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas sit amet pretium urna. Vivamus venenatis velit nec
neque ultricies, eget elementum magna tristique. Quisque vehicula, risus eget aliquam placerat, purus leo tincidunt
eros, eget luctus quam orci in velit. Praesent scelerisque tortor sed accumsan convallis.
</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas sit amet pretium urna. Vivamus venenatis velit nec
neque ultricies, eget elementum magna tristique. Quisque vehicula, risus eget aliquam placerat, purus leo tincidunt
eros, eget luctus quam orci in velit. Praesent scelerisque tortor sed accumsan convallis.
</p>
</div>
<div class="column side">
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit..</p>
</div>
</div>
</body>
</html>
-->
nie znam JavaScript, a potrzeba jest funkcja która ustawi jednakową wysokość we wszystkich trzech <div-ach>, ale bez użycia frameworków, w czystym JS.