cneter div with div postion way
HTML
<div class="parent">
<div class="child">
</div>
</div>
CSS
.parent {
width: 300px;
height: 200px;
border: 1px solid black;
}
.child {
width: 200px;
height: 100px;
border: 1px solid red;
position: relative;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
}