header {
position: relative;
background-color: black;
height: 35vh;
min-height: 25rem;
width: 100%;
overflow: hidden;
}

header .container {
position: relative;
z-index: 2;
}

header img {
position: absolute;
top: 50%;
left: 50%;
min-width: 100%;
min-height: 100%;
width: auto;
height: auto;
z-index: 0;

• ms-transform: translateX(-50%) translateY(-50%);
• moz-transform: translateX(-50%) translateY(-50%);
• webkit-transform: translateX(-50%) translateY(-50%); transform: translateX(-50%) translateY(-50%); }