css 中心绝对在视口中

Posted 2021-05-13

<div id="centerme">
    Hello, world!
</div>​

#centerme
{
    position: absolute;
    left: 50%;
    top: 50%;

    /* You must set a size manually */
    width: 100px;
    height: 50px;

    /* Set negative margins equal to half the size */
    margin-left​: -50px;
    margin-top: -25px;
}