how to make the img in center of the screen html code example

Example 1: align image to the center of the screen

.centered {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

Example 2: position images in center of container

.image-container {
    width: 500px;
    height: 500px;
    position: relative;
}

.image-container img {
    position: absolute;
    right: 0;
    left: 0;
    top: 0;
    bottom: 0;
    margin: auto auto;
}