*{
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
    color: rgb(238, 15, 15);
    font: caption;
}
body{
    width: 1024px;
    margin-left: 450px;
    background:linear-gradient(rgb(4, 74, 167) , rgb(77, 5, 73));
}
#header h1{
    font-weight: bold;
    color: rgb(255, 255, 255);
}
#header{
    text-align: center;
    height: 120px;
    padding-top: 60px;
    font-size: large;
    background-image: url(../images/BNP_Paribas_Fortis.png);
}
footer{
    height: 120px;
    padding-top: 100px;
    margin-top: 450px;
    text-align: center;
    background:linear-gradient(rgb(4, 74, 167) , rgb(77, 5, 73));
    opacity: 0.9;
}
.nav ul{
    list-style: none;
    max-width:  200px;
    min-height: 210px;
}
.nav ul a:hover{
    text-transform: uppercase;
}
.nav ul a li:hover{
    background-color: chartreuse;
    text-transform: uppercase;
}
.nav ul a{
    text-decoration: none;
    color: black;
}
.nav{
    background:linear-gradient(rgb(4, 74, 167) , rgb(77, 5, 73));
    align-items: center;
    text-align: center;
    position: sticky ;
    left: 0;
    top: 0;
    z-index: 1000;
    width: 200px;
}
.nav ul a li {
    
    padding: 22.5px;
}
.les-bases a button:hover{
    text-transform: uppercase;
    background-color: chartreuse;
    cursor: pointer;
}
.les-bases a button{
    min-height: 300px;
    min-width: 300px;
    font-size: x-large;
   
}
.un,.deux,.trois,.quatres{
    display: block;
    
}

.un , .deux{
    margin-left: 724px;
    
}
.trois ,.quatres{
    margin-left: 424px;
}
.trois{
    margin-top: -300px;
}
.quatres{
    margin-top: -600px;
}
.les-bases{
    width: 600px;
    height: 600px;
    margin-bottom: -210px;
    
}
.un{
    margin-top: -210px;
}
.les-bases .un button{
    background-image: url(../images/Jujutsu\ Kaisen\ Yes\ Sticker\ \(1\).gif);
}
.les-bases .deux button{
    background-image: url(../images/code-geek-2680204_640.png);
    background-position: center;
}
.les-bases .trois button{
    background-image: url(../images/OIP.jpg);
    background-repeat: no-repeat;
    background-position: center;
}
.les-bases .quatres button{
    background-image: url(../images/7698902-icone-profil-avatar-geek-gamer-gratuit-vectoriel\ \(1\).jpg);
    background-position: center;
}
.content{
       width: 824px;
       margin-left: 200px;
       margin-top: -210px; 
       text-align: center;
}
.content h1{
    margin-bottom: 40px;
    font-size: 50px;
    color: gold;
    text-decoration: underline;
}
.content h2{
    text-align: center;
    margin: 20px 0px;
    color: gold;
    font-size: 60px;
}
.content p {
    margin: 20px 0px;
    font-size: 20px;
}