.center{display:block;
        margin-left: auto;
        margin-right:auto;
        width:50%}
.container {
  display: grid;
  grid-gap: 10px;
  grid-template:
    "header header"
    "sidebar main"
    "footer footer"
    / 100px 1fr;
}

header { grid-area: header; }
aside { grid-area: sidebar; }
main { grid-area: main; }
footer { grid-area: footer; }
/* The sidebar menu */
.sidenav {
  height: 100%; /* Full-height: remove this if you want "auto" height */
  width: 160px; /* Set the width of the sidebar */
  position: fixed; /* Fixed Sidebar (stay in place on scroll) */
  z-index: 1; /* Stay on top */
  top: 0; /* Stay at the top */
  left: 0;
  background-color: #111; /* Black */
  overflow-x: hidden; /* Disable horizontal scroll */
  padding-top: 20px;
}
.sidenav2 {
  height: 100%; /* Full-height: remove this if you want "auto" height */
  width: 160px; /* Set the width of the sidebar */
  position: fixed; /* Fixed Sidebar (stay in place on scroll) */
  z-index: 1; /* Stay on top */
  top: 0; /* Stay at the top */
  right: 0;
  background-color: #111; /* Black */
  overflow-x: hidden; /* Disable horizontal scroll */
  padding-top: 20px;
}