html{
 height:100vh;
 width:100vw;
 background:rgb(230,230,250);
  
 background-position: 50% 15%;
 background-repeat: no-repeat;
 background-size: 50%;
 margin:0 ;
 padding:0;
}

body{
    margin:0 ;
    padding:0;
}

header{
    background:rgba(176,178,188,1.0);
    width:100%;
    Height:120px;
    margin:0 ;
    padding:0;
}

img{
    height:100px;
    width:100px;
}