* {
    box-sizing: border-box;
}

body {
    font-family: sans-serif;
    background-color: #fafafa;
    margin: 0;
}

header .bandeau {
    display: block;
    background-color: #333;
    color: white;
    padding: 10px;
}

header .bandeau form {
    display: inline;
}

header .bandeau button {
    border: none;
    background-color: gold;
    color: black;
    padding: 5px 10px;
    margin: 0 5px;
    border-radius: 3px;
}

header .bandeau button:hover {
    background-color: goldenrod;
}

header .bandeau button:active {
    background-color: darkgoldenrod;
}

main {
    margin: 20px auto;
    width: clamp(350px, 60%, 1200px);
    background-color: white;
    padding: 10px;
}

h1 {
    text-align: center;
}

nav.semaine {
    width: 100%;
    display: flex;
    background-color: #ddd;
    justify-content: center;
}

nav.semaine .select, nav.semaine .label {
    padding: 5px;
    text-align: center;
}

nav.semaine .select { background-color: dodgerblue; color: white; width: 1em; }
nav.semaine .select:hover { background-color: #0077ea; }

nav.semaine .label:hover {
    background-color: #ccc;
}

p.programme {
    border-left: 5px solid gold;
    padding: 10px;
    background-color: #ffffdd;
}

footer {
    text-align: center;
}