flexbox布局，媒体查询自适应屏幕大小，box-sizing-The idle Process

flexbox布局，媒体查询自适应屏幕大小，box-sizing

box-sizing的用途：防止盒子被撑大。

假设有个块元素，width和height都是200px，如果这个块元素的border是1px，那么这个时候块元素的实际宽高就是202px；假设块元素设置padding属性为1px，那么这个时候块元素的实际宽高就是204px。所以，块元素的padding和border实际都会撑大这个盒子。

要让盒子保持原来的尺寸，不受border和padding的影响的话，可以在css中加这么一句话：

* {

box-sizing: border-box;

}

box-sizing更改默认的计算元素宽高属性值。更改为border-box后，width=content+border+padding

媒体查询自适应屏幕大小

不同的设备浏览器大小是不同的，媒体查询就是查询窗口大小动态的显示或者调整元素。

@media (min/max-width: px)

{

元素 {

width: px;

height: px;

}

@media (prefers-reduced-motion:no-preference){* {
  scroll-behavior: smooth;
}}

flexbox布局

弹性布局方式，与常规的流式或块式布局不同。items 将会在主轴 (main axis) 或者在交叉轴(cross axis) 排版。

display: flex

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clear元素清除浮动float

clear元素用来清除左边或者右边或者两边的浮动元素(float) 比如： <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> <style> img { float:left; border:1px solid red; } p.clear { clear:both; } </style> </head> <body> <img src="logocss.gif" width="95" height="84" /> <p>This is some text. This is some text. This is some text. This is some text. This is some text. This is some text.</p> <p class="clear">This is also some text. This is also some text. This is also some text. This is also some text. This is also some text. This is also some text.</p> </body> </html> 第一段p没有指定clear，因此左边会有图片，而第二段class是clear，clear: both，清除了两边的浮动元素，左右都不会出现浮动元素，所以它自己占单独的行，不和其他浮动元素占一行。

The idle Process

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