How to center an image in HTML CSS?

div.container {
	display: flex;
}
img {
	margin: auto; /* aligns the image in the center both from x & y axis */
}

div.container {
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

div.container {
  display: flex;
  align-items: center;
}

div.container {
	position: relative;
}
img {
	position: absolute;
	top: 50%; /* push the image 50% from the top */
	left: 50%; /* push the image 50% from the left */
	transform: translate(-50%, -50%);
	/* push back the image by 50% from the left & top accordingly */
}

img {
	display: block;
	margin: 0 auto;
}

div.container {
	position: relative;	
}	
img {
	position: absolute;
	top: 50%;
	transform: translateY(-50%);
}