CodePen Embed - Centering in CSS

Live

​x
 
<div class="g-wrap">
    <div class="g-container absolute">
        <div class="sub"></div>
    </div>
​
    <div class="g-container autobot">
        <div class="sub"></div>
    </div>
​
    <div class="g-container flex">
        <div class="sub"></div>
    </div>
​
    <div class="g-container grid">
        <div class="sub"></div>
    </div>
</div>
​
<div class="g-tips">
    <div><span>absolute</span></div>
    <div><span>autobot</span></div>
    <div><span>flex</span></div>
    <div><span>grid</span></div>
</div>
​

Live

xxxxxxxxxx
 
.g-wrap {
    display: flex;
    justify-content: space-around;
    padding: 10px;
    box-sizing: border-box;
}
​
.g-tips {
    margin-top: 24px;
    display: flex;
    justify-content: space-around;
    font-size: 14px;
    font-weight: bold;
    
    div {
        width: 250px;
        text-align: center;
    }
    
    span {
        color: deeppink;
    }
}
​
.g-container {
    width: 200px;
    height: 200px;
    background: #999;
}
​
.sub {
    width: 100px;
    height: 100px;
    background: #333;
}
​
.absolute {
    position: relative;
    
    & > div {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%); 
    }
}
​
.absolute {
    position: relative;
    
    & > div {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%); 
    }
}
​
.autobot {
    display: flex;
    
    & > div {
        margin: auto;
    }
}
​
.flex {
    display: flex;
    justify-content: center;
    align-items: center;
}
​
.grid {
    display: grid;
    place-content: center;
}
​
​

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