body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}

.topnav {
  overflow: hidden;
  background-color: #333;
}

.topnav a {
  float: left;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}

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

.topnav a.active {
  background-color: #4CAF50;
  color: white;
}

.flex-container {
  display: flex;
}

.brother_photo {
  border-radius: 50%;
  overflow: hidden;
  vertical-align: middle;
  border: 0;
}

.centered {
  display: table;
  margin: 0 auto;
}

#img-row {
  margin: 0 auto;
}

.center {
  width:100%;
  display: flex;
  justify-content: center;
}