:root{
    --theme: #016dcf;
}
html, body{
    width: 100%;
}
body {
    color: var(--theme);
    margin: 0px;
    font-family: 'arial';
    background-attachment: fixed;
    background-size: 100%;
    background-repeat: no-repeat;
    background-color: black;
    background-image: url("../asset/fond.webp");
}

header {
    background-color: rgba(0, 0, 0, 0.5);
    margin: auto;
    margin-bottom: 1em;
}

h1 {
    font-size: 3em;
    text-align: center;
    margin: 0;
}

nav {
    text-align: center;
}

nav li {
    display: inline;
    list-style: none;
}

li > a {
    display: inline-block;
    padding: 14px 16px;
    color: white;
}

nav li > a:hover {
    background-color: var(--theme);
}

.border-theme {
    border-color: var(--theme);
}

*{
    text-decoration: none;
    box-sizing: border-box;
}

@media all and (max-device-width: 480px) {
    .ts-box, li a, h1, header{
        width: 100%;
        margin: 0;
    }    
    header {
        font-size: 0.7em;
        background-color: rgba(0, 0, 0, 0.55);
    }
    nav {
        padding-bottom: 10px;
    }
}