header {
    padding: 100px 25px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 50px;
    flex-wrap: wrap;
    width: 100%;
  }
  
  .header_text {
    width: 600px;
  }
  
  .circle {
    height: 250px;
    width: 250px;
    max-height: 80vw;
    max-width: 80vw;
    overflow: hidden;
    border-radius: 50%;
    border: 5px solid var(--main-brand-color);
    display: flex;
    justify-content: center;
    align-items: center;
  }
  
  .circle img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  
  
  /* Navigationsleiste */
  nav {
    margin-bottom: 120px;
  }
  
  nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
  }
  
  nav a {
    color: var(--secondary-text-color);
    text-decoration: none;
    position: relative;
    padding: 3px;
  }
  
  nav a:hover {
    color: var(--text-color);
  }
  
  nav a::after {
    content: '';
    height: 2px;
    width: 0;
    background: var(--main-brand-color);
    position: absolute;
    bottom: 0;
    left: 0;
    transition: 150ms ease-in-out;
  }
  
  nav a:hover::after {
    width: 100%;
  }
  
  /* Damit die Schrift sich an das kleine Fenster anpasst: responsive */
  @media (max-width: 800px) {
    header {
      padding: 50px 25px;
    }
    h1 {
      font-size: 12vw;
      text-align: center;
    }
    .subheading {
      text-align: center;
    }
  }