效果

html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="container">
<div class="container-left"></div>
<div class="container-mid">
<div class="item">1</div>
<div class="item">2</div>
<div class="item">3</div>
<div class="item">4</div>
</div>
<div class="container-right">
<div class="item-header">header</div>
<div class="box">1</div>
<div class="box">2</div>
<div class="box">3</div>
<div class="box">4</div>
</div>
</div>
</body>
</html>
css
.body {
margin: 0;
padding: 0;
}
.container {
width: 1100px;
margin: 0 auto;
height: 800px;
display: flex;
}
.container-left {
width: 300px;
background-color: rgb(171, 171, 246);
}
.container-mid {
flex: 1;
display: grid;
grid-template-rows: 1fr 1fr;
grid-template-columns: 1fr 1fr;
background-color: rgb(165, 122, 122);
gap: 10px;
}
.item {
border: solid 1px black;
}
.container-right {
width: 200px;
display: flex;
flex-direction: column;
}
.item-header {
height: 60px;
background-color: #b9b371;
}
.box {
flex: 1;
background-color: #bbf8f9;
border: solid 1px black;
}