<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
html,
body,
div,
span,
applet,
object,
iframe,
h1,
h2,
h3,
h4,
h5,
h6,
p,
blockquote,
pre,
a,
abbr,
acronym,
address,
big,
cite,
code,
del,
dfn,
em,
img,
ins,
kbd,
q,
s,
samp,
small,
strike,
strong,
sub,
sup,
tt,
var,
b,
u,
i,
center,
dl,
dt,
dd,
ol,
ul,
li,
fieldset,
form,
label,
legend,
table,
caption,
tbody,
tfoot,
thead,
tr,
th,
td,
article,
aside,
canvas,
details,
embed,
figure,
figcaption,
footer,
header,
hgroup,
main,
menu,
nav,
output,
ruby,
section,
summary,
time,
mark,
audio,
video {
margin: 0;
padding: 0;
border: 0;
font-size: 100%;
font: inherit;
vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
main,
menu,
nav,
section {
display: block;
}
/* HTML5 hidden-attribute fix for newer browsers */
*[hidden] {
display: none;
}
body {
line-height: 1;
}
ol,
ul {
list-style: none;
}
blockquote,
q {
quotes: none;
}
blockquote:before,
blockquote:after,
q:before,
q:after {
content: '';
content: none;
}
table {
border-collapse: collapse;
border-spacing: 0;
}
body {
margin: 0 0 2rem 2rem;
width: 90%;
height: 20rem;
border: 2px solid seagreen;
display: inline-flex;
flex-direction: row;
flex-wrap: wrap;
justify-content: center;
align-items: center;
}
div {
width: 200px;
height: 200px;
background-color: coral;
border: 1px solid black
}
</style>
</head>
<body>
<div class="main">
1
</div>
<div class="vice">2</div>
<div class="cao">3</div>
<!-- <div class="cao">4</div>
<div class="cao">5</div>
<div class="cao">6</div>
<div class="cao">7</div>
<div class="cao">8</div>
<div class="cao">9</div>
<div class="cao">10</div>
<div class="cao">11</div>
<div class="cao">12</div> -->
</body>
</html>
image.png
// 用伪类
.middle {
text-align:center;
}
.middle:before {
content:'';
display:inline-block;
height:100%;
vertical-align: middle;
}
// 比如是<image class="middle img"/>给加了middle 的 class，需要再弄一个
.img {
vertical-align: middle;
}
// 用表格来渲染 （不太好）
.box {
width:100px;
height:100px;
border:1px solid black;
display: table-cell;
vertical-align: middle;
text-align: center;
}
// 用css3 的transform
.dialog {
width: 100px;
height: 100px;
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
}
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