1. Horizontal center

<div class="box"></div>
 
.box{
    width: 100px;
    height: 100px;
    margin: 0 auto;
    background: #E33;
}
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2. Center horizontally and vertically

(1) Absolute positioning horizontal vertical center

<div class="box">
     <div></div>
</div>
 
.box {
    width: 100%;
    height: 500px;
    background: #e33;
    position: relative;
}
.box>div{
    width: 100px;
    height: 100px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: gold;
}
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(3) Flex flex layout is vertically and horizontally centered

<div class="box">
   <div></div>
</div>
 
.box {
    width: 100%;
    height: 500px;
    background: #e33;
    display: flex;
    align-items: center;
    justify-content: center;
}
.box>div{
    width: 100px;
    height: 100px;
    background: gold;
}
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