<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
*{
margin: 0px;
padding: 0px;
}
.grid{
/* 2 行 3列 */
display: grid;
/* 设置列 1fr 代表 (100%-30%-30%)的宽度 */
grid-template-columns: 30% 30% 1fr;
/* 设置 格子行高度*/
grid-template-rows: 70px 70px;
/* 设置列间距 */
grid-column-gap: 10px;
/* 设置行间距 */
grid-row-gap: 10px;
}
.item1{
background-color: black;
}
.item2{
background-color: green;
}
.item3{
background-color: gray;
}
.item4{
background-color: blue;
}
.item5{
background-color: salmon;
}
.item6{
background-color: skyblue;
}
</style>
</head>
<body>
<div class="grid">
<div class="item1"></div>
<div class="item2"></div>
<div class="item3"></div>
<div class="item4"></div>
<div class="item5"></div>
<div class="item6"></div>
</div>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
*{
margin: 0px;
padding: 0px;
}
.grid{
width: 100%;
/* 2 行 3列 */
display: grid;
/* 设置列 1fr 代表 (100%-30%-30%)的宽度 */
grid-template-columns:30% 1fr;
/* 设置 格子行高度*/
grid-template-rows:70px 1fr;
position: fixed;
height: 100%;
}
.item1{
/* 跨行 */
/* 从表格的列第几个线起 */
grid-column-start: 1;
/* 从表格的列第几个线终 */
grid-column-end:3;
background-color: black;
}
.item2{
background-color: green;
}
.item3{
background-color: red;
}
</style>
</head>
<body>
<div class="grid">
<div class="item1">1</div>
<div class="item2">2</div>
<div class="item3">3</div>
</div>
</body>
</html>
