css上下左右中央

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.logo {
display: block;
text-align: center;
border: 4px solid #dddddd;
height: 74px;
width: 74px;
}
.logo * {
display: inline-block;
height: 100%;
vertical-align: middle;
}

.logo .photo {
height: auto;
width: auto;
 font-size:24px;
 font-weight:900
 }