Header is smaller but the space between Site name and Site description stills the same.
Here is all the changes I put in the CSS customisation :
#hgroup-wrap {
background-color:#a1460e;
background-image: url(“http://localhost/Projets/Barils/BA01/wp-content/uploads/2015/09/champ.jpg”);
-webkit-border-top-right-radius: 50px;
-webkit-border-top-left-radius: 50px;
-moz-border-radius-topright: 50px;
-moz-border-radius-topleft: 50px;
border-top-right-radius: 50px;
border-top-left-radius: 50px;
}
#site-generator {
background-color:#a1460e;
-webkit-border-bottom-right-radius: 50px;
-webkit-border-bottom-left-radius: 50px;
-moz-border-radius-bottomright: 50px;
-moz-border-radius-bottomleft: 50px;
border-bottom-right-radius: 50px;
border-bottom-left-radius: 50px;
}
#site-branding, #masthead #site-header { padding: 0; }
.entry-footer { display: none; }
.category .page-header { display: none; }
footer.entry-meta { display: none; }
.entry-header .entry-meta { display: none; }
.home #content .entry-title { display: none; }
#site-title { line-height: 1; }