我希望在调整浏览器大小时能够向下移动.secDiv。当前，缩小浏览器时，.boxes中的彩色正方形与.secDiv重叠。
请协助。
* {
box-sizing: border-box;
margin: 0;
padding: 0;
}
.boxes {
position: relative;
width: 100%;
height: 300px;
border: 2px solid pink;
display: flex;
flex-wrap: wrap;
justify-content: space-around;
align-items: center;
}
.red {
width: 300px;
background-color: red;
height: 150px;
margin: 15px;
}
.green {
width: 300px;
background-color: green;
height: 150px;
margin: 15px;
}
.blue {
width: 300px;
background-color: blue;
height: 150px;
margin: 15px;
}
.secDiv {
position: relative;
width: 100%;
height: 300px;
border: 2px solid yellow;
display: flex;
flex-wrap: wrap;
justify-content: space-around;
align-items: center;
}
.red2 {
width: 300px;
background-color: red;
height: 150px;
margin: 15px;
}
.green2 {
width: 300px;
background-color: green;
height: 150px;
margin: 15px;
}
.blue2 {
width: 300px;
background-color: blue;
height: 150px;
margin: 15px;
}<div class="boxes">
<div class="red"></div>
<div class="green"></div>
<div class="blue"></div>
</div>
<div class="secDiv">
<div class="red2"></div>
<div class="green2"></div>
<div class="blue2"></div>
</div>我建议使用动态高度，如%或vh。因为你有一个固定的高度300px。当调整大小时，它会尽量保持这个高度，只是当你调整大小时你的内容不适合300像素的高度。如果你想使用固定的高度，你可以使用像overflow-y: scroll这样简单的东西，但我不认为这是你想要的。我在您的boxes和secDiv类上添加了width: 50%。您可以使用50%、25%或任何您想要的最终结果。但在寻找响应式设计时，我会远离使用固定单元。
* {
box-sizing: border-box;
margin: 0;
padding: 0;
}
.boxes {
position: relative;
width: 100%;
height: 50%;
border: 2px solid pink;
display: flex;
flex-wrap: wrap;
justify-content: space-around;
align-items: center;
}
.red {
width: 300px;
background-color: red;
height: 150px;
margin: 15px;
}
.green {
width: 300px;
background-color: green;
height: 150px;
margin: 15px;
}
.blue {
width: 300px;
background-color: blue;
height: 150px;
margin: 15px;
}
.secDiv {
position: relative;
width: 100%;
height: 50%;
border: 2px solid yellow;
display: flex;
flex-wrap: wrap;
justify-content: space-around;
align-items: center;
}
.red2 {
width: 300px;
background-color: red;
height: 150px;
margin: 15px;
}
.green2 {
width: 300px;
background-color: green;
height: 150px;
margin: 15px;
}
.blue2 {
width: 300px;
background-color: blue;
height: 150px;
margin: 15px;
}<div class="boxes">
<div class="red"></div>
<div class="green"></div>
<div class="blue"></div>
</div>
<div class="secDiv">
<div class="red2"></div>
<div class="green2"></div>
<div class="blue2"></div>
</div>我添加了@media查询，因此当浏览器调整大小时，它会相应地更改，<div>的查询会很好地相互分解。
* {
box-sizing: border-box;
margin: 0;
padding: 0;
}
body {
height: 100vh;
}
.boxes {
position: relative;
width: 100%;
height: 300px;
border: 2px solid pink;
display: flex;
flex-wrap: wrap;
justify-content: space-around;
align-items: center;
}
.red {
width: 300px;
background-color: red;
height: 150px;
margin: 15px;
}
.green {
width: 300px;
background-color: green;
height: 150px;
margin: 15px;
}
.blue {
width: 300px;
background-color: blue;
height: 150px;
margin: 15px;
}
.secDiv {
position: relative;
width: 100%;
height: 300px;
border: 2px solid yellow;
display: flex;
flex-wrap: wrap;
justify-content: space-around;
align-items: center;
}
.red2 {
width: 300px;
background-color: red;
height: 150px;
margin: 15px;
}
.green2 {
width: 300px;
background-color: green;
height: 150px;
margin: 15px;
}
.blue2 {
width: 300px;
background-color: blue;
height: 150px;
margin: 15px;
}
@media(max-width: 994px) {
.secDiv, .boxes {
height: 600px;
}
}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="style.css">
<title>Document</title>
</head>
<body>
<div class="boxes">
<div class="red"></div>
<div class="green"></div>
<div class="blue"></div>
</div>
<div class="secDiv">
<div class="red2"></div>
<div class="green2"></div>
<div class="blue2"></div>
</div>
</body>
</html>