.header{background-size:cover;background-position:center center;display:flex;align-items:center;justify-content:center;position:relative;height:400px}.center-header-text{text-align:center;position:relative}.header:before{content:"";display:block;position:absolute;top:0;left:0;right:0;bottom:0}@media only screen and (max-width:768px){.header{height:200px}}