Background properties
element {
background-image: url('');
background-position: 50% center;
background-size: cover;
background-repeat: no-repeat;
/* same as */
background: url('') 50% center / cover no-repeat;
}
background-position: 50% center; // x-pos y-pos, or one keyword 'center'
background-size: cover; // Resize the background image to cover the entire container