*, *:before, *:after {
    box-sizing: border-box;
  }

body {
    margin: 8px 13px;
    display: grid;
    grid-gap: 10px;
    grid-template-columns: 174px minmax(0, 1fr);
}

header, footer {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr min-content;
}

.banner {
    grid-column: 1 / -1;
}

.header-right, .footer-right {
    text-align: right;
    white-space: nowrap;
}

.main-menu ul {
    font-size: 1.5em;
    list-style: none;
    display: flex;
    float: right;
    margin: 0;
    margin-right: 1em;
    padding: 0;
}

.main-menu > ul > li > a {
    padding: 0 1em;
    text-decoration: none;
    color: black;
    border-left: 1px solid black;
    display: flex;
    align-items: center;
    justify-content: start;
    gap: 0.25em;
}
.main-menu svg {
    height: 1em;
    width: 1em;
    vertical-align: middle;
}

.main-menu > ul > li:last-child > a {
    border-right: 1px solid black;
}

.main-menu > ul > li > a:hover {
    background-color: #ccc;
}

.sidebar {
    position: sticky;
    top: 0;
    align-self: start;
}

@media (prefers-color-scheme: dark) {
    .main-menu > ul > li > a, .main-menu > ul > li:last-child > a {
        color: #bbb; 
        border-color: #bbb;
    }
    .main-menu svg {
        stroke: #bbb;
        fill: #bbb;
    }
}

/* IE10 & 11 Grid */
body { display: -ms-grid; -ms-grid-columns: 174px minmax(0, 1fr); }
header, footer { display: -ms-grid; -ms-grid-columns: 1fr 1fr min-content; }
header  { -ms-grid-row: 1; -ms-grid-column: 1; -ms-grid-column-span: 2; }
   header .header-left   {-ms-grid-row: 1; -ms-grid-column: 1; }
   header .header-middle {-ms-grid-row: 1; -ms-grid-column: 2; }
   header .header-right  {-ms-grid-row: 1; -ms-grid-column: 3; }
   header .banner        {-ms-grid-row: 2; -ms-grid-column: 1; -ms-grid-column-span: 3; }
aside   { -ms-grid-row: 2; -ms-grid-column: 1; }
article { -ms-grid-row: 2; -ms-grid-column: 2; }
footer  { -ms-grid-row: 3; -ms-grid-column: 1; -ms-grid-column-span: 2; }
   footer .banner        {-ms-grid-row: 1; -ms-grid-column: 1; -ms-grid-column-span: 3; }
   footer .footer-left   {-ms-grid-row: 2; -ms-grid-column: 1; }
   footer .footer-middle {-ms-grid-row: 2; -ms-grid-column: 2; }
   footer .footer-right  {-ms-grid-row: 2; -ms-grid-column: 3; }