* {
  box-sizing: border-box;
}
html, body {
  height: 100%;
  display: flex;
  flex-direction: column;
  font-family: "Lucida Sans", sans-serif;
}

.header {
  background-color: #ffffff;
  color: #ffffff;
  padding: 0px;
  text-align: center;
}

 .topnav {
  display: flex;
  background-image: url("rail47.png");
  justify-content: center;
}
  
 .topnav a {
  display: flex;
  color: #f2f2f2;
  padding: 14px 16px;
  text-decoration: none;
  font-weight: bold;
}

.topnav a:hover {
  display: inline-block;
  background-color: #f2f2f2;
  color: #565656;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

.column {
  display: flex;
  flex-direction: column;
  float: left;
  padding: 10px;
}

.column.left {
  width: 30%;
  overflow: auto;
  text-align: right;
}
 .column.left a {
  display: inline block;
  color: #000000;
  padding: 10px;
  text-decoration: none;
  font-weight: bold;
}
.column.middle {
  width: 40%;
  overflow: auto;
  text-align: center;
}
.column.middle a {
  display: inline; /* the default for span */
  width: 65px;
  height: 48px;
  padding: 5px 10px;  
  background-color: white; 
}
.main {
  padding: 15px;
}
.column.right {
  width: 30%;
  overflow: auto;
  text-align: left;
}
/* Clear floats after the columns */
.row::after {
  content: "";
  display: table;
  clear: both;
}

.footer {
  margin-top: auto;
  background-color: #565656;
  text-align: center;
  font-size: 12px;
  padding: 15px;
}

@media screen and (max-width: 600px) {
  .column.side, .column.middle {
    width: 100%;
  }