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


}

header{
background-color: orangered;
padding: 5px;
text-align: center;
position: fixed;
width: 100%;
z-index: 1;
top: 0px;
left: 0px;
}
header h1{
    color: white;
    border: 8px solid white;
    padding: 6px 12px;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: inline-block;
    border-radius: 50px;
    
}
.banner{
    position: relative;
}
.banner img{
    max-width: 100%;
}
.banner .welcome{
    color: white;
    padding: 30px;

    background-color: #FEB614;
    position: absolute;
    left: 0px;
  top: 21%;
}
.banner h2{
    font-size: 70px;
}
.banner h2 span{
font-size: 1.3em
}
nav{
    background-color: #F4F4F4;
    padding: 20px;
    position: sticky;
    top: 75px;
}
nav ul{
    white-space: nowrap;
    max-width: 1200px;
    margin: 0 auto;
}
nav li{
    width: 25%;
    display: inline-block;
    font-size: 24px;

}
nav li a{
    text-decoration: none;
    color: #4B4B4B;
}
nav li a.join{
    color: orangered;
}
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;
}
.imag{
    text-align: center;
    margin: 80px 0;
    white-space: nowrap;
}
.imag li{
    display: inline-block;
    width: 40%;
    margin: 20px 5%;
}
.imag li img{
    max-width: 100%;
}
section.join{
    background: #F4F4F4;
    text-align: center;
    padding: 60px 20px;
    color: #4B4B4B;
}
.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: orangered;
    color: white;
    padding: 10px;
    text-align: center;
}

/*Pseudo Classes single ":" */

nav li a:hover{
    text-decoration: underline;
    background-color: rgb(151, 240, 116);
    padding: 8px;
    border-radius: 24px;
}
.imag li:hover{
    position: relative;
    top: -7px;

}
form input:focus{
    border: 4px dashed #4B4B4B;
}
form input:valid{
    border: 4px solid rgb(132, 206, 14);
}

/*Pseudo Elements double "::"*/

article p::first-line{
  font-weight: bold;
  font-size: 1.2em;

}
section.join p::first-letter{
    font-size: 1.5em;
}
p::selection{
    background-color: orangered;
    color: white;
}
p::after{
    content: '...';
}
/*Media Queries choix mobile, ordi etc*/
@media screen and (max-width: 1400px){
    .banner .welcome h2{
        font-size: 50px;
    }
    nav li{
        font-size: 18px;
    }
}

@media screen and (max-width: 960px){
    .banner .welcome h2{
        font-size: 40px;
    }
}

@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: 25px;
    }
    .banner .welcome span{
        font-size: 1em;
    }
    .imag li{
        width: 100%;
        margin: 20px auto;
        display: block;
    }

}


@media screen and (max-width: 600px){
    nav li{
       font-size: 20px; 
       position: relative;
       display: block;
       width: 100%;
       margin: 12px 0;
    }
    header{
        position: relative;
    } 
    nav{
        top:0;
    }
}