4. 宽度不定，如何实现三个元素按照 1：1：1 布局
DETAILS
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Flexbox Example</title>
<style>
.container {
display: flex;
}
.box {
flex: 1;
border: 1px solid black;
padding: 10px;
text-align: center;
}
</style>
</head>
<body>
<div class="container">
<div class="box">Box 1</div>
<div class="box">Box 2</div>
<div class="box">Box 3</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" />
<title>Grid Example</title>
<style>
.container {
display: grid;
grid-template-columns: 1fr 1fr 1fr;
}
.box {
border: 1px solid black;
padding: 10px;
text-align: center;
}
</style>
</head>
<body>
<div class="container">
<div class="box">Box 1</div>
<div class="box">Box 2</div>
<div class="box">Box 3</div>
</div>
</body>
</html>
