塊級元素 水平垂直居中

<div class="wrap">
    <div class="box">fdsa</div>
</div>

1.方法一

.wrap {
    width: 800px;
    height: 500px;
    border: 1px solid blue;
    position: relative;
}

.box {
    width: 200px;
    height: 100px;
    background: orange;
    position: absolute;
    top
 
: 50%;
    left: 50%;
    margin-top: -50px;
    margin-left: -100px;
}

2.方法二

.wrap {
    width: 800px;
    height: 500px;
    border: 1px solid blue;
}

.box {
    width: 200px;
    height: 100px;
    background: orange;
    margin: 200px auto;
}

3.方法三

.wrap {
    width: 800px;
    height: 500px;
    border
 
: 1px solid blue;
    position: relative;
}

.box {
    width: 200px;
    height: 100px;
    background: orange;
    position: absolute;
    top: 50%;
    left: 50%;
    -webkit-transform: translate(-50%,-50%); 
}

4.方法四

.wrap {
    width: 800px;
    height: 500px;
    border: 1px solid blue;
    display: flex
 
;
    align-items: center;
}

.box {
    width: 200px;
    height: 100px;
    background: orange;
    margin: 0 auto;
}

5.方法五

.wrap {
    width: 800px;
    height: 500px;
    border: 1px solid blue;
    display: -webkit-box;
    -webkit-box-pack: center;
    -webkit-box-align: center;
}

.box {
    width: 200px;
    height: 100px;
    background: orange;
}

行內元素 水平垂直居中

<div class="wrap">
    kylin
</div>

1.方法一

.wrap {
    width: 800px;
    height: 500px;
    border: 1px solid blue;
    display: table-cell;
    vertical-align: middle;
    text-align: center;
}

2.方法二

.wrap {
    width: 800px;
    height: 500px;
    border: 1px solid blue;
    line-height: 500px;
    text-align: center;
}

3.方法三

.wrap {
    width: 800px;
    height: 500px;
    border: 1px solid blue;
    display: -webkit-box;
    -webkit-box-pack: center;
    -webkit-box-align: center;
}