CSS solution for centering elements with variable width and height

1. Horizontal center

Public code:

html:

<div class="parent">
    parent
    <br>
    <div class="child">
        child
    </div>
</div>

css:

html, body {
    margin: 0;
    width: 100%;
    height: 100%;

    .parent {
        width: 100%;
        height: 100%;
        background: #fac3fa;
        
        .child {
            width: 50%;
            height: 50%;
            background: #fe9d38;
        }
    }
}

Solution 1: text-align (parent) + inline-block (child)

Code:
css:

.parent {
    text-align: center;

    .child {
        display: inline-block;
    }
}

Solution 2: Block-level elements + margin: 0 auto;

.child {
    display: block; // Set margin: 0 auto for non-block-level elements;
}

Solution 3: absolute + transform

.parent {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

Option 4: flex

Note: Due to the use of flex, parent and <br> are removed here

.parent {
    display: flex;
    justify-content: center;
}

2. Vertical centering

Public code:
html:

<div class="parent">
    <div class="child"></div>
</div>

css:

html, body {
    margin: 0;
    width: 100%;
    height: 100%;
}
.parent {
    display: table-cell;
    width: 800px;
    height: 500px;
    background: #fac3fa;

    .child {
        width: 50%;
        height: 50%;
        background: #fe9d38;
    }
}

Solution 1: table-cell (parent) + vertical-align (child)

.parent {
    display: table-cell;
    vertical-align: middle;
}

Solution 2: absolute + transform

.parent {
    position: relative;
    
    .child {
        position: absolute;
        top: 50%;
        transform: translateY(-50%);
    }
}

Option 3: flex

.parent {
    display: flex;
    align-items: center;
}

3. Horizontal and vertical centering

Public code is the same as [vertical center]

Common solution 1: absolute + transform

.parent {
    position: relative;
    
    .child {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
    }
}

Common solution 2: flex

.parent {
    display: flex;
    align-items: center;
    justify-content: center;
}

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