header{
  padding: 100px 25px;
  display: flex;
  justify-content: left;
  align-items: center;
  gap: 50px;
  flex-wrap: wrap;

}

#headline h1{
  text-align: center;
  margin-left: auto;
  margin-right: auto;
  justify-content: center;
  display: flex;
}

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-color: var(--main-brand-color);
  position: absolute;
  bottom: 0;
  left: 0;
  transition: 150ms ease-in-out;
}

nav a:hover::after{
  width: 100%;
}

#toggle_button{
  display: none;
}

label[for="toggle_button"]{
  display: none;
}

label[for="toggle_button"] span{
  font-size: 80px;
}

@media(max-device-width: 800px){

  nav{
    position: absolute;
    top: 0;
    left: 0;
    background-color: var(--secondary-color);
    padding: 15px;
    border-radius: 0 0 25px 0;
  }

  nav ul{
    display: none;
    flex-direction: column;
  }

  nav ul li{
    font-size: 60px;
  }

  #toggle_button:checked ~ ul{
    display: flex;
  }

  label[for="toggle_button"]{
    display: block;
  }

}