center a div css

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

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

IMG.displayed {
    display: block;
    margin-left: auto;
    margin-right: auto }
 ...
&lt;IMG class="displayed" src="..." alt="..."&gt;

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