<div class="container">
<div class="dialog"></div>
</div>
.container {
position:fixed;
top:0;
right:0;
bottom:0;
left:0;
text-align:center;
font-size:0;
overflow:auto;
}
.container:after {
content:"";
display:inline-block;
height:100%;
vertical-align:middle;
}
.dialog {
display:inline-block;
vertical-align:middle;
} mainly don"t know where the baseline of this container is
this is demo
@ CRIMX
it turns out that the question can still circle people.
you replace the child of .kids with a lowercase x , and the bottom of this x is the location of the baseline.
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