.header {
    margin-top: -5px;
    height: 200px;
    width: 1000px;
    background-image: url(../img/header.jpg)
}

.top-separator {
  position: relative; top:200px; width:100%; height:5px; background-color: #707c82;
}

.sidebar {
    display: flex;
}

nav#main-menu {
    margin-top:-5px;
    height:200px;
    width:100%;
}

.content {
    display: flex;
}