css background 一半_CSS小技巧
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css background 一半_CSS小技巧
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.big{
width: 300px;
height: 300px;
background-color: #999;}
.smallOne{
width: 100px;
height: 100px;
background-color: red;
float: left;}
.smallTwo{
width: 100px;
height: 100px;
background-color: red;
float: right;}
.clearfix{
content: "";
display: block;
clear: both;}style>head><body><div class="big clearfix"><div class="smallOne">div><div class="smallTwo">div>div>body>html>
.big{
width: 300px;
height: 300px;
background-color: #999;}
.smallOne{
width: 100px;
height: 100px;
background-color: red;
float: left;}
.smallTwo{
width: 100px;
height: 100px;
background-color: green;
float: left;}
.smallThree{
width: 100px;
height: 100px;
background-color: red;
float: left;}
.clearfix{
content: "";
display: block;
clear: both;}style>head><body><div class="big clearfix"><div class="smallOne">div><div class="smallTwo">div><div class="smallThree">div>div>body>html>
.big{
width: 200px;
height: 100px;
background-color: #999;
text-align: center;}style>head><body><div class="big"><span>我在這里span>div>body>html>
.big{
width: 200px;
height: 100px;
background-color: #999;
text-align: center;}
.small{
width: 100px;
height: 20px;
background-color: red;
margin: 0 auto;}style>head><body><div class="big"><div class="small">我在這里div>div>body>html>
.big{
width: 200px;
height: 100px;
background-color: #aaa;
line-height: 100px;}style>head><body><div class="big">
這里是文本!div>body>html>
.big{
height: 200px;
width: 200px;
background-color: red;
position: relative;}
.small{
height: 50px;
width: 50px;
background-color: black;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);}style>head><body><div class="big"><div class="small">div>div>body>html>
左右布局
將內部的子元素加浮動,父元素清除浮動即可。
代碼:
DOCTYPE html><html><head><title>testtitle><style type="text/css">.big{
width: 300px;
height: 300px;
background-color: #999;}
.smallOne{
width: 100px;
height: 100px;
background-color: red;
float: left;}
.smallTwo{
width: 100px;
height: 100px;
background-color: red;
float: right;}
.clearfix{
content: "";
display: block;
clear: both;}style>head><body><div class="big clearfix"><div class="smallOne">div><div class="smallTwo">div>div>body>html>
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效果:
左中右布局
?浮動 清除浮動
代碼:
DOCTYPE html><html><head><title>testtitle><style type="text/css">.big{
width: 300px;
height: 300px;
background-color: #999;}
.smallOne{
width: 100px;
height: 100px;
background-color: red;
float: left;}
.smallTwo{
width: 100px;
height: 100px;
background-color: green;
float: left;}
.smallThree{
width: 100px;
height: 100px;
background-color: red;
float: left;}
.clearfix{
content: "";
display: block;
clear: both;}style>head><body><div class="big clearfix"><div class="smallOne">div><div class="smallTwo">div><div class="smallThree">div>div>body>html>
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效果:
?水平居中
?內聯元素居中:
text-align: center;
代碼:
DOCTYPE html><html><head><title>testtitle><style type="text/css">.big{
width: 200px;
height: 100px;
background-color: #999;
text-align: center;}style>head><body><div class="big"><span>我在這里span>div>body>html>
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效果圖:
?塊級元素居中:
margin:0 auto
代碼:
DOCTYPE html><html><head><title>testtitle><style type="text/css">.big{
width: 200px;
height: 100px;
background-color: #999;
text-align: center;}
.small{
width: 100px;
height: 20px;
background-color: red;
margin: 0 auto;}style>head><body><div class="big"><div class="small">我在這里div>div>body>html>
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效果圖:
垂直居中
父元素高度確定的單行文本
設置 height = line-height
?代碼:
DOCTYPE html><html><head><title>testtitle><style type="text/css">.big{
width: 200px;
height: 100px;
background-color: #aaa;
line-height: 100px;}style>head><body><div class="big">
這里是文本!div>body>html>
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效果圖:
塊級元素垂直居中
利用父元素相對定位,子元素絕對定位,并且處置、水平方向個偏移50%,子元素利用負值偏移自身寬度、長度的一半,這種方式同樣適用于水平居中。
代碼:
DOCTYPE html><html><head><title>testtitle><style type="text/css">.big{
height: 200px;
width: 200px;
background-color: red;
position: relative;}
.small{
height: 50px;
width: 50px;
background-color: black;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);}style>head><body><div class="big"><div class="small">div>div>body>html>
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效果圖:
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