table {
border-collapse: collapse;
border-spacing: 0;
}

td, th {
padding: 5px;
border-bottom: 1px solid #aaa;

}

.topnav {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
}

.topnav a {
  float: left;
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

.topnav a:hover {
  background-color: #ddd;
  color: blue;
}


.link {
  background-color: #191970;
  color: white;
  padding: 10px 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  border: thin solid black;
  border-radius: 4px;
}

ul.a {
  list-style-type: none;
}

div.mainbody {
    margin: auto;
    padding: 10px;
}

/*Collapsible*/
.collapsible {
    background-color:darkred;
    color: white;
    cursor: pointer;
    padding: 10px;
    width: 50%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 14px;
    transition: 0.4s;
}

.active, .collapsible:hover {
    background-color: darkred;
}

.content {
    padding: 0 10px;
    width: 45%;
    background-color: white;
    color: black;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.2s ease-out;
}

.collapsible:after {
    content: '\02795';
    font-size: 12px;
    color: black;
    float: right;
    margin-left: 5px;
}

.active:after {
    content: "\2796";
}