CSSPractice/vcentered.css at main · BoonWei/CSSPractice · GitHub

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/* 绝对定位 */

/* #container{
    background-color: black;
    width: 500px;
    height: 500px;
    position: relative;
}

#box{
    background-color: rgb(169, 238, 234);
    width: 200px;
    height: 200px;
    color: white;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
}  */


/*flex方法： 在父元素中进行修改 */
/*
#container{
    background-color: black;
    width: 500px;
    height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#box{
    background-color: rgb(169, 238, 234);
    width: 200px;
    height: 200px;
    color: white;
} */


/*transform*/
#container{
    background-color: rgb(116, 127, 224);
    width: 500px;
    height: 500px;
    position: relative;
}

#box{
    background-color: rgb(169, 238, 234);
    width: 200px;
    height: 200px;
    color: white;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}