body, h1, h2, h3, ul, li, a, img {
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
}

header{
    background-color: #F63232;
    top: 0;
    left: 0;
    padding: 20px;
    text-align: center;
    position: fixed;
    width: 100%;
    z-index: 1;
}

header h1 {
    color: white;
    border: 8px solid white;
    padding: 6px 12px;
    display: inline-block;
    border-radius: 36px;
}

.banner {
    position: relative;
}

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

.banner .welcome{
    background-color: #FEB614;
    color: white;
    padding: 30px;
    font-size: 60px;
    position: absolute;
    left: 0;
    top: 30%;
}

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

nav{
    background-color: #F4F4F4;
    padding: 20px;
    position: sticky;
    top: 105px;
    z-index: 9;
}

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

nav li {
    width: 25%;
    display: inline-block;
    font-size: 28px;
}

nav li a {
    color: #4B4B4B;
    text-decoration: none;
}

nav .main-nav li a.join {
    color: #F63232;
}
main {
    max-width: 100%;
    width: 1200px;
    margin: 80px auto;
    padding: 0 40px;
    box-sizing: border-box;
}

article h2 {
    color: #F63232;
    font-size: 48px;
}

article p{
    line-height: 2em;
    color: #4B4B4B;
}

.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.join{
    background-color: #F4F4F4;
    text-align: center;
    padding: 60px 20px;
    color: #4B4B4B;
}

section.join h2 {
    font-size: 36px;
}

form input {
    margin: 20px 0;
    padding: 10px 20px;
    font-size: 24px;
    border-radius: 28px ;
    border: 4px solid white;
}

footer{
    background-color: #F63232;
    color: white;
    padding: 10px;
    text-align: center;
}

/* Pesudo class */
nav li:hover{
    text-decoration: underline;
}

.images li:hover {
    position: relative;
    top: -10px;
}

form input:focus {
    border: 4px dashed #4B4B4B;
    outline: none;
}

form input:valid {
    border: 4px dashed #71d300;
}

article p::first-line {
    font-size: 1.3em;
    font-weight: bold;
}

section.join p::first-letter {
    font-size: 1.5em;
}

/* Responsive Design */

@media screen and (max-width:1200px) {
  .welcome h2 {
    font-size: 44px;
  }
}

@media screen and (max-width:765px) {
  header{
    position: static;
  }
  header h1{
    border: 4px solid white;
    padding: 3px 6px;
    font-size: 15px;
  }
  .banner {
    position: static;
  }
  .banner .welcome {
    position: static;
    padding: 13px;
    text-align: center;
  }
  .banner .welcome h2 {
    font-size: 20px;
  }
  .banner .welcome br {
    display: none;
  }
  .banner .welcome span {
    font-size: 1em;
  }
  .welcome h2 {
    font-size: 34px;
  }

  nav {
    position: static;
    /* text-align: center; */
  }  

  nav.main-nav ul{
    text-align: center;
    /* background-color: red; */
  }

  .main-nav ul{
    text-align: center;
    margin: 0 auto;
  }

  .main-nav li{
    display: block;
    width: 100%;
    font-size: 18px;
    line-height: 1.5em;
  }

  .images li {
    display: block;
    width: 90%;
  }

  .images li:hover{
    position: static;
  }

}


/* #F63232  red */
/* #FEB614 yellow */
/* #F4F4F4 grey */
/* #4B4B4B black grey */

/* body,h1, h2, h3, p, nav, img {
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
}

header {
    background-color: #F63232;
    color: white;
    text-align: center;
    padding: 15px;
    position: fixed;
    width: 100%;
    z-index: 10;
}

header h1 {
    border: 3px solid white;
    display: inline-block;
    padding: 10px 20px;
    border-radius: 36px;
}

.banner{
    position: relative;
}

.banner img{
    width: 100%;
}

.banner .welcome {
    background-color: #FEB614;
    display: inline-block;
    color: white;
    padding: 10px;
    position: absolute;
    top: 30%;
    left: 0;
    font-size: 65px;
}

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

nav {
    background-color: #F4F4F4;
    padding: 15px 0;
    position: sticky;
    top: 90px;
}

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

nav ul li {
    width: 25%;
    display: inline-block;
    
}

nav ul li a {
    text-decoration: none;
    color: #4B4B4B;
    font-size: 24px;
}

nav ul li a.join {
    color: #F63232;
}

main {
    max-width: 100%;
    width: 1200px;
    margin: 80px auto;
}

main h2 {
    color: #F63232;
    font-size: 36px;
    margin-bottom: 15px;
}

main p {
    line-height: 2em;
    color: #4B4B4B;
}

.images {
    white-space: nowrap;
}

.images li {
    display: inline-block;
    width: 40%;
    margin:10px 5%;
}

.images li img {
    width: 100%;
}

.join {
    background-color: #F4F4F4;
    text-align: center;
    padding: 20px;
    color: #4B4B4B;
}

.join h2 {
    font-size: 35px;
}

.join h2 {
    padding: 20px 10px;
}

form input {
    margin: 20px 0;
    padding: 10px 20px;
    border-radius: 28px;
    border: 4px solid white;
}

footer {
    background-color: #F63232;
    color: white;
    padding: 20px;
    text-align: center;
}
 */


 /* body, ul, li, h1, h2, a{
    margin: 0;
    padding: 0;
    font-family: tahoma;
  }
  p{
    font-size: 18px;
  }
  header{
    background-color: #F63232;
    padding: 20px 0;
    text-align: center;
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 1;
  }
  header h1{
    color: white;
    border: 8px solid white;
    display: inline-block;
    padding: 6px 12px;
    border-radius: 36px;
  }
  .banner{
    position: relative;
  }
  .banner img{
    max-width: 100%;
  }
  .banner .welcome{
    background:#FEB614;
    color: white;
    padding: 30px;
    font-size: 60px;
    position: absolute;
    left: 0;
    top: 30%;
  } 
  .banner .welcome span{
    font-size: 1.4em;
  }
  nav{
    background: #F4F4F4;
    padding: 20px;
    position: sticky;
    top: 106px;
    z-index: 1;
  }
  nav ul{
    white-space: nowrap;
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
  }
  nav li{
    width: 25%;
    display: inline-block;
    font-size: 24px;
  }
  nav li a{
    text-decoration: none;
    color: #4B4B4B;
  }
  nav li a:hover{
    text-decoration: underline;
  }
  nav li a.join{
    color: #F63232;
  }
  main{
    max-width: 100%;
    width: 1200px;
    margin: 80px auto;
    padding: 0 40px;
    box-sizing: border-box;
  }
  article h2{
    color: #F63232;
    font-size: 48px;
  }
  article p{
    line-height: 2em;
    color: #4B4B4B;
  }
  article p::first-line{
    font-weight: bold;
    font-size: 1.2em;
  }
  .images{
    text-align: center;
    margin: 80px 0;
    white-space: nowrap;
  }
  .images li{
    display: inline-block;
    list-style-type: none;
    width: 40%;
    margin: 20px 5%;
    position: relative;
  }
  .images li:hover{
    top: -4px;
  }
  .images li img{
    max-width: 100%;
  }
  section.join{
    background: #F4F4F4;
    text-align: center;
    padding: 60px 20px;
    color: #4B4B4B;
  }
  section.join h2{
    font-size: 36px;
  }
  form input{
    margin: 20px 0;
    padding: 10px 20px;
    font-size: 24px;
    border-radius: 28px;
    border: 4px solid white;
  }
  form input:focus{
    border: 4px dashed #4B4B4B;
    outline: none;
  }
  form input:valid{
    border: 4px solid #71d300;
  }
  footer{
    background: #F63232;
    color: white;
    padding: 10px;
    text-align: center;
  }
  
  
  @media screen and (max-width: 1400px){
  
    .banner .welcome{
      font-size: 40px;
    }
  
  }
  
  @media screen and (max-width: 960px){
  
    .banner .welcome{
      font-size: 28px;
    }
    nav li{
      font-size: 18px;
    }
  
  }
  
  @media screen and (max-width: 700px){
  
    .banner .welcome{
      font-size: 20px;
      position: relative;
      text-align: center;
    }
    .banner .welcome br{
      display: none;
    }
    .banner .welcome span{
      font-size: 1em;
    }
    nav li{
      font-size: 18px;
    }
    .images li{
      width: 100%;
      display: block;
      margin: 20px auto;
    }
  
  }
  
  @media screen and (max-width: 560px){
  
    .banner .welcome{
      font-size: 20px;
      position: relative;
      text-align: center;
    }
    .banner .welcome br{
      display: none;
    }
    .banner .welcome span{
      font-size: 1em;
    }
    nav li{
      display: block;
      width: 100%;
      margin: 12px 0;
    }
    article h2{
      font-size: 36px;
    }
    header, nav{
      position: relative;
      top: 0;
    }
    
  
  } */