body, ul, li, h1, h2, a{
  margin: 0;
  padding: 0;
  font-family: Georgia, serif;
}

body{
  background-color: blue;
}
header{
  background-color: blue;
  padding: 20px;
  text-align: center;
  position: fixed;
  width: 100%;
  z-index: 1;
  top: 0;
  left: 0;
}

header h1{
  font-style: Georgia, serif;
  color: gold;
  border: 8px solid gold;
  padding: 6px 12px;
  display: inline-block;
  border-radius: 10px;
}

.banner{
  position: relative;
}

.banner img{
  max-width: 100%;
}

.banner .welcome{
  background-color: blue;
  color: gold;
  padding: 30px;
  position: absolute;
  right: 10%;
  top: 40%;
}

.banner h2{
  font-size: 30px;
}

.banner h2 span{
  font-size: 1.3em;
}

nav{
  background-color: gold;
  padding: 20px;
  position: sticky;
  top: 104px;
}

nav li{
  width: 25%;
  display: inline-block;
  font-size: 24px;
}

nav ul{
  white-space: nowrap;
  max-width: 1200px;
  margin: 0 auto;
}

nav li a{
  text-decoration: none;
  color: black;
}

main{
  max-width: 100%;
  width: 1200px;
  margin: 80px auto;
  padding: 0 40px;
  box-sizing: border-box;
}

article h2{
  color: gold;
  font-size: 48px;
}

article p{
  line-height: 2em;
  color: white;
}

.images{
  text-align: center;
  margin: 80px 0;
  white-space: nowrap;
}

.images li{
  display: inline-block;
  width: 40%;
  margin: 20px 5%;
}

.images li img{
  max-width: 100%;
}

section.feedback{
  background: blue;
  text-align: center;
  padding: 90px 20px;
  color: white;
}

.feedback h2{
  font-size: 36px;
}

footer{
  background: gold;
  color: black;
  padding: 10px;
  text-align: center;
}

nav li a:hover{
  text-decoration: underline;
}

.images li:hover{
  position: relative;
  top: -4px;
}

form textarea:valid{
  border: 4px solid gold;
}

section.banner img::selection{
  background-color: gold;
}

div.welcome h2::selection{
  background-color: black;
  color: gold;
}

div.welcome span::selection{
  background-color: black;
  color: gold;
}

header h1::selection{
  background-color: black;
  color: gold;
}

nav li a::selection{
  background-color: black;
  color: gold;
}

article h2::selection{
  background-color: black;
  color: gold;
}

article p::selection{
  background-color: black;
  color: gold;
}

ul.images img::selection{
  background-color: gold;
}

section.feedback h2::selection{
  background-color: black;
  color: gold;
}

section.feedback label::selection{
  background-color: black;
  color: gold;
}

section.feedback p::selection{
  background-color: black;
  color: gold;
}

section.feedback textarea::selection{
  background-color: black;
  color: gold;
}

p.copyright::selection{
  background-color: black;
  color: gold;
}

@media screen and (max-width: 1400px){
  
  .banner .welcome h2{
    font-size: 35px;
  }
  
  nav li{
    font-size: 18px;
  }

  header{
    position: relative;
  }

}

@media screen and (max-width: 960px){
  
  .banner .welcome h2{
    font-size: 30px;
  }

  header{
    position: relative;
  }

}

@media screen and (max-width: 700px){
  
  .banner .welcome {
    position: relative;
    text-align: center;
    padding: 10px;
  }

  .banner .welcome br{
    display: none;
  }
  
  .banner .welcome h2{
    font-size: 35px;
  }

  .banner .welcome span{
    font-size: 1em;
  }

  .images li{
    width: 100%;
    margin: 20px auto;
    display: block;
  }

  header{
    position: relative;
  }

}

@media screen and (max-width: 460px){
  
  .banner .welcome {
    position: relative;
    text-align: center;
    padding: 10px;
  }

  .banner .welcome br{
    display: none;
  }
  
  .banner .welcome h2{
    font-size: 25px;
  }

  .banner .welcome span{
    font-size: 1em;
  }
  
  nav li{
    font-size: 17px;
    display: block;
    width: 100%;
    margin: 10px 0;
  }

  nav{
    top: 0;
  }

  header{
    position: relative;
  }

}