What is the best way to horizontally center a div that doesn't have a set width

I am a beginner in CSS and have been experimenting with various solutions from Stack Overflow, but so far none of them seem to be working for my specific case.

Below is the parent div code from an existing application where I cannot control the inline style, hence why I used !important:

element.style {
    display: block;
    height: 662px;
    width: 1460px;
}
#ModalScroll{
    position:fixed !important;
    top:0;
    left:0;
    z-index:1001; 
    height:1px;
    width:1px;
    overflow:hidden;
    display:none;
    font-size:100%;
    text-align:center;
}

Child div code:

element.style {
    display: block;
    left: 470px;
    margin-top: 150.5px;
    top: 315px;
    width: 500px;
}

.ModalDialog{
    border:1px solid #3C4749;
    background-color:#FFF;
    margin:0 auto 0 auto;
    display:none;
    position:absolute !important;
    font-size: 12px;
    top: 0px !important;
    box-sizing: border-box; 
    text-align: center; 
    vertical-align: middle;

The width of the div can vary, and it is perfectly centered vertically, however, I am facing challenges in centering it horizontally.

Answer №1

Implementing position:absolute along with the translate technique can achieve the desired result:

yourElement{
    position: absolute;
    left: 50%;
    -webkit-transform: translateX(-50%);
    -moz-transform: translateX(-50%);
    -ms-transform: translateX(-50%);
    transform: translateX(-50%);
}

Answer №2

I found a quick fix for this issue by including a child div element:

{
...
    right: 0px !important;
    left : 0px !important;
}

Answer №3

You can use this method to center an element with a specified width:

{
    margin-left:auto;
    margin-right:auto;
}

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