Фоновая картинка на всё разрешение окна?

body { 
    background-image: url(https://compass-ssl.xbox.com/assets/12/02/120203e0-f7d1-4731-9a6c-be3c458c6ce9.jpg?n=Resident-Evil-2_GLP-Page-Hero-1084_1920x600.jpg); 
    background-size: cover; 
    background-repeat: no-repeat; 
    background-position-x: center; 
    background-position-y: center; 
    background-attachment: fixed; 
    min-height: 100vh; 
}

html, 
body { 
  margin: 0; 
  padding: 0; 
} 
 
.block { 
  height: 100vh; 
  background-image: url("http://placeimg.com/500/300/an"); 
  background-size: cover; 
  background-attachment: fixed; 
} 
 
.content { 
  margin: 0 auto; 
  width: 50%; 
  min-height: 200px; 
  background: rgba(0, 0, 0, 0.5); 
} 
.block1 {min-height: 400px;}

<div class="block"> 
  <div class="content"> 
  </div> 
</div> 
<div class="block1">следующий блок</div>