*,
*:before,
*:after {
  box-sizing: border-box;
}
img {
  max-width : 100%;
  height    : auto;
}
body{
   font-family: Arial, sans-serif;
   display: flex;
   justify-content: center;
   align-items: center;
   background-image: url('../img/fondo.jpg');
   -webkit-background-size: cover;
   background-size: cover;
   background-repeat: no-repeat;
   background-position: center;
   height: 100vh;
   width: 100%;
   overflow: hidden;
   padding: 0;
   margin: 0;
}

body img{
   position: relative;
   top: -50px;
}