css的三种引入方式
1内行式
2.内嵌式
3.外部样式表
内行式和内嵌式
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><style>input{border: 1px solid green;width: 60px;height: 40px;background-color: aquamarine;color: black;font-size: 22px;font-family: '行书';border-radius: 5px;}</style></head>
<body><!-- --><!-- <input type="button" value="按钮"style="border: 1px solid green;width: 60px;height: 40px;background-color: aquamarine;color: black;font-size: 22px;font-family: '行书';border-radius: 5px;"> --><input type="button" value="按钮"><input type="button" value="按钮"></body>
</html>外部样式表
一个css的文件
input{border: 1px solid green;
width: 60px;
height: 40px;
background-color: aquamarine;
color: black;
font-size: 22px;
font-family: '行书';
border-radius: 5px;
}代码如下：
<!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 href="css/btn.css" rel="stylesheet">
</head>
<body><input type="button" value="按钮">
<input type="button" value="按钮">
<input type="button" value="按钮">选择器
1元素选择器
2id选择器
3class选择器
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><style>#六花{border: 1px solid green;width: 60px;height: 40px;background-color: aquamarine;color: black;font-size: 22px;font-family: '行书';border-radius: 5px;}</style> --><!--
元素选择器<style>input{border: 1px solid green;width: 60px;height: 40px;background-color: aquamarine;color: black;font-size: 22px;font-family: '行书';border-radius: 5px;}</style>--><style>.shapeClass{width: 60px;height: 40px;}.colorclass{background-color: aquamarine;color: black;border: 1px solid green;}.fontClass{font-size: 22px;font-family: '行书';border-radius: 5px;}</style></head>
<body><input id="六花" class="colorclass shapeClass fontClass" type="button" value="按钮"><input type="button" value="按钮"><input id="二奶" type="button" value="按钮"></body>
</html>浮动
float: 加上方位
如：float: right;
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><style>.outerdiv{background-color:burlywood ;height: 500px;width: 600px; }.innerdiv{height:60px ;width: 100px;border: 1px solid black;}.d1{background-color: green;float: right;}.d2{background-color: red;float: right;}.d3{background-color: yellow;float: right;}</style></head>
<body><div class="outerdiv" ><div class="innerdiv d1">diva</div><div class="innerdiv d2">divx</div><div class="innerdiv d3">divy</div></div></body>
</html>定位
position
static 默认（不行动）
absolute 绝对 其他的会填充
relative 相对原来的位置 其他的不会填充
fixed 相对浏览器的窗口 其他的会填充
top
right
left
bottom
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><style>.outerdiv{background-color:burlywood ;height: 500px;width: 600px; }.innerdiv{height:60px ;width: 100px;border: 1px solid black;}.d1{background-color: green;position: static;top: 60px;left: 60px;}.d2{background-color: red;}.d3{background-color: yellow;}</style></head>
<body><div class="outerdiv" ><div class="innerdiv d1">diva</div><div class="innerdiv d2">divx</div><div class="innerdiv d3">divy</div></div></body>
</html>盒子模型
内边距 padding
外边距 margin
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title><style>.outerdiv{background-color:burlywood ;height: 500px;width: 600px; margin: 0px auto;}.innerdiv{height:60px ;width: 100px;border: 1px solid black;float: left;}.d1{background-color: green;margin-right: 10px;padding-top: 20px;}.d2{background-color: red;margin-left: 10px;}.d3{background-color: yellow;}</style></head>
<body><div class="outerdiv" ><div class="innerdiv d1">diva</div><div class="innerdiv d2">divx</div><div class="innerdiv d3">divy</div></div></body>
</html>
