* {
  padding: 0px;
  margin: 0px;
  box-sizing: border-box;
}

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

.topnav a {
  float: left;
  display: block;
  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: red;
  color: white;
}

.topnav .icon {
  display: none;
}

body {
  border: 3px solid black;
}

body>h1 {
  text-align: center;
  color: red;
  text-decoration: underline black;
}

body>main>section>div>img {
  padding: 20px;
  max-width: 230px;
  max-height: 250px;
}

body>main>section>h2 {
  font-size: 30px;
  text-align: center;
}

body>main>section>h3 {
  font-size: 30px;
  text-align: center;
}

body>main>section>h4 {
  font-size: 30px;
  text-align: center;
}

.reklam {
  color: black;
  background-color: red;
  text-align: center;
  padding: 20px 25px;
}

footer>small>b {
  color: red;
  background-color: black;
}

@media screen and (max-width: 600px) {
  .topnav a:not(:first-child) {
    display: none;
  }

  .topnav a.icon {
    float: right;
    display: block;
  }

  .topnav.responsive {
    position: relative;
  }

  .topnav.responsive a.icon {
    position: absolute;
    right: 0;
    top: 0;
  }

  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
}

@media screen and (min-width:600px) {
  .topnav a {
    float: left;
    color: #f2f2f2;
    text-align: center;
    padding: 24px 36px;
    text-decoration: none;
    font-size: 20px;
  }

  body>main>section>div>img {
    max-width: 300px;
    max-height: 300px;
  }

  .img {
    display: flex;
    justify-content: center;
    align-items: center;
  }

  body>main>section>p {
    text-align: center;
    font-size: 20px;
  }

  body>h1 {
    text-align: center;
    color: red;
    text-decoration: underline black;
    font-size: 50px;
  }
}