.topnav {
    overflow: hidden;
    background-color: #660000;
  }.topnav a {
    float: left;
    display: block;
    color: #FFCC00;
    text-align: center;
    padding: 12px 12px;
    text-decoration: none;
    font-family: "Poppins", sans-serif;
    font-variant: small-caps;
    font-size: 15px;
    font-weight: bold;
  }.topnav a:hover {
    background-color: #FF9900;
    color: black;
  }.topnav a.active {
    background-color: #FF9900;
    color: #660000;
  }.topnav .icon {
    display: none;
  }	
  @media screen and (max-width: 600px) {
    .topnav a:not(:first-child) {display: none;}
    .topnav a.icon {
      float: right;
      display: block;
    }
  }	
  @media screen and (max-width: 600px) {
    .topnav.responsive {position: relative;}
    .topnav.responsive .icon {
      position: absolute;
      right: 0;
      top: 0;
    }.topnav.responsive a {
      float: none;
      display: block;
      text-align: left;
    }
  }.flex-container {
    display: flex;
    flex-direction: row;
    text-align: justify;
  }
  .flex-container-gallery {
    display: flex;
    flex-direction: row;
    text-align: center;
  }
  
  .first {
    background-color: #e9e9e6;
    padding: 10px;
    flex: 17%;
  }
  
  .second {
    background-color: rgb(248, 242, 242);
    padding: 10px;
    flex: 17%;
  }
  .right {
    background-color: #ffd000;
    padding: 15px;
    flex: 30%;
  }
  .left {
    background-color: #ffd000;
    padding: 15px;
    flex: 70%;
  }.thermo {
    background-color: #e9e9e6;
    padding: 5px;
    flex: 12%;
  }.gallery {
    background-color:rgb(248, 242, 242);
    padding: 0px;
    flex: 10%;
  }
  
  /* Responsive layout - makes a one column-layout instead of two-column layout */
  @media (max-width: 600px) {
    .flex-container {
    flex-direction: column;
    }
  }