css实现div内图片的垂直、水平居中

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.img_v {
display:table-cell !important;
display:block;
position:static !important;
position:relative;
overflow:hidden;
width:400px;
height:400px;
border:1px solid #000;
vertical-align:middle;
text-align:center;
}
.img_v p {
display:table-cell !important;
display:block;
margin:0;
position:static !important;
position:absolute;
top:50%;
left:50%;
width:400px;
margin-left:auto;
margin-right:auto;
}
.img_v img {
position:static !important;
position:relative;
top:auto !important;
top:-50%;
left:auto !important;
left:-50%;
}