footer {
   padding-bottom: 20px;
   border-top: 3px solid var(--main-bg-color);
 }
 
 footer ul {
   position: relative;
   right: 20px;
   display: flex;
   justify-content: center;
   list-style-type: none;
   padding-inline-start: 0px;
 }
 
 footer li {
   color: var(--main-bg-color);
   font-weight: bold;
   font-size: 1em;
   margin-left: 0.8em;
   margin-right: 0.8em;
 }
 
 footer a:link {
   text-decoration: none;
 }
 
 footer a:visited {
   color: var(--main-bg-color);
 }
 
 footer a:hover {
   text-decoration: underline;
   cursor: pointer;
 }

 /* Back to Top Button */
.returnTop {
  z-index: 1;
  bottom: 1%;
  cursor: pointer;
  display: none;
  filter: alpha(opacity=50);
  /* IE < 8 */
  height: 40px;
  opacity: 0.5;
  position: fixed;
  right: 1%;
  width: 40px;
}

.returnTop:hover {
  filter: alpha(opacity=100);
  /* IE < 8 */
  opacity: 1;
}

 /* https://www.w3schools.com/howto/howto_css_modals.asp */
 /* The Modal (background) */
 .modal {
  display: none; /* Hidden by default */
  position: fixed; /* Stay in place */
  z-index: 1; /* Sit on top */
  padding-top: 100px; /* Location of the box */
  left: 0;
  top: 0;
  width: 100%; /* Full width */
  height: 100%; /* Full height */
  overflow: auto; /* Enable scroll if needed */
  background-color: rgb(0,0,0); /* Fallback color */
  background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
}

/* Modal Content */
.modal-content {
  background-color: #fefefe;
  margin: auto;
  padding: 20px;
  border: 1px solid #888;
  width: 92%;
}

.modal-content h3 {
  text-align: center;
}

.modal-content p {
  margin-top: 0rem;
  margin-bottom: 0rem;
}

/* The Close Button */
.close {
  color: #aaa;
  float: right;
  font-size: 2rem;
  font-weight: bold;
}

.close:hover,
.close:focus {
  color: #000;
  text-decoration: none;
  cursor: pointer;
}