body, html {
    margin: 0;
    font-family: sans-serif;
    background-color: rgb(230, 227, 235);
}

.content {
    margin: 30px;
}

table, td, th {
    border: 1px solid #aaa;
}

table {
    text-align: left;
    position: relative;
    border-collapse: collapse;
}

th {
    position: sticky;
    top: 0;
    height: 30px;
    background-color:#191961;
    color: white;
}

td {
    text-align: center;
    padding: 5px;
}

tr:hover {
    background-color: #c1c8ee;
}

#content {
    width: 70%;
}

.center {
    margin-left: 20px;
    margin-right: 20px;
  }

  ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #333;
    
  }
  
  li {
    float: left;
    border-right: 1px solid #bbb;
  }
  
  li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
  }
  
  /* Change the link color to #111 (black) on hover */
  li a:hover {
    background-color: #111;
  }

  .active {
    background-color: #191961;
  }