body {
    background-image: url(../img/bitcoincircuit.jpg);
    background-size: cover;
    margin-top: 0px;
    margin-bottom: 0px;
}

@media screen and (min-width: 510px){
main {
    width: 80%;
    max-width: calc(100%-40px);
    min-width: 500px;
    margin: auto;
    background-color: forestgreen;
    padding-top: 20px;
    padding-bottom: 20px;
    margin-top: 0px;
    animation: basHaut 1s linear;
}
}

@media screen and (min-width: 510px){
header{
    padding: 30em;
    padding-left: 2em;
    padding-bottom: 2px;
    }
}

header h1{
    margin-left: 0px;
    padding-left: 0px;
    margin-right: 15em;
}

h1 {
    text-align: center;
    color: white;
    padding-left: 8px;
    font-size: 2em;
}

h1:hover{
    color: gold;
}

h2 {
    color: white;
    padding-left: 15px;
}

h2:hover{
    color: gold;
}

p{
    background-color: forestgreen;
    color: white;
    padding: 20px;
    padding-left: 30px;
    padding-right: 30px;
}

nav {
    width: 100%;
    margin: auto;
    height: 5px;
    background: black;
    padding-bottom: 5px;
    margin-bottom: 50px;
    margin-right: 10px;
}

nav li {
    margin: auto;
    float: right;
    min-width: 250px;
    background-color: black;
    margin-top: 5px;
    text-align: center;
    list-style-type: none;
    border-bottom-right-radius: 30%;
    border-bottom-left-radius: 30%;
    margin-right: 10%;
}

nav li:first-child {
    margin: auto;
    float: left;
    min-width: 250px;
    background-color: black;
    margin-top: 5px;
    text-align: center;
    list-style-type: none;
    border-bottom-right-radius: 30%;
    border-bottom-left-radius: 30%;
    margin-left: 10%;
}

nav a{
    margin: auto;
    display: block;
    text-decoration: none;
    color: white;
    padding-bottom: 15px;
    padding-left: 15px;
    padding-right: 15px;
}

nav li:hover{
    background-color: gold;
}

details{
    color: black;
}

a{
/*    padding-left: 30px;*/
/*    padding-right: 30px;*/
    color: white;
    font-size: 15px;
}

a:hover{
    color: gold;
}

nav a:hover{
    color: white;
}

#menu-index {
    margin-top: 300px
}
@media screen and (min-width: 510px){
    @keyframes basHaut {
        from {
            padding-top: 1000px;
        }
        to {
            padding-top: 20px;
        }
}
}


header h1{
    font-size: 100px
}

@media screen and (max-width: 510px) {
    main{
        background-color: forestgreen;
    }
    nav li{
        min-width: 100px;
    }    
    nav li:first-child{
        min-width: 100px;
    }
     header h1{
        font-size: 50px;
        margin-right: 0em;
    }
    header h1{
        margin-bottom: -250px
    }
    body{
        margin-bottom: 500px;
        background-position: center;
    }
    div {
        display: flex;
        margin: auto;
        padding-left: 15px;
        padding-right: 15px;
    }
}