.site-header{
  margin: auto;
}

.site-header .top-row{
  display:none;
  width:100%;
  height:50px;
}

.site-header .middle-row{
  width:100%;
  height:100%;
}

.site-header .middle-row .left-block{
  text-align:left;
  float:left;
  width:30%;
  height:100%;
}

.site-header .middle-row .right-block{
  float:right;
  text-align:right;
  width:70%;
  height:100%;
}

.site-header .bottom-row{
  display:none;
  width:100%;
  height:50px;
}