body, html{
    width: 100%;
    height: 100%;
  }
  
  body{
    
    background-color: rgb(255, 255, 255);
  }
div .conteudo{
    position: relative;
    padding: 0px; /* preenchimento */
    border: 1px solid rgb(255, 255, 255); /* borda */
    
  }
  img{  
    position: absolute;  
    overflow: hidden;  
    top: 50%;  
    left: 50%;
    -webkit-transform: translate(-50%,-50%);  
    -moz-transform: translate(-50%,-50%);  
    -ms-transform: translate(-50%,-50%);  
    -o-transform: translate(-50%,-50%);  
    transform: translate(-50%,-50%); 
  }