body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: #f5f7fb;
    color: #111827;
}
header {
    padding: 24px 20px 12px;
    margin: 1em auto 3em;
    background: #7dd3d3;
}
h1 {
    margin: 0 0 8px;
    font-size: 2rem;
}
p {
    margin: 0 0 12px;
    color: #4b5563;
    padding-left: 10px;
    padding-top: 10px;
    padding-bottom: 5px;
}
.links a {
    display: inline-block;
    margin-right: 12px;
    margin-bottom: 8px;
    padding: 10px 14px;
    border-radius: 4px;
    text-decoration: none;
    background:
        radial-gradient(ellipse at top, #e66465, #166465),
        radial-gradient(ellipse at bottom, #4d9f0c, #4dcf0c);
    color: white;
    transition:
        background 0.5s,
        color 0.5s;
}
.links a:hover {
    background:
        radial-gradient(ellipse at top, #d664e5, transparent),
        radial-gradient(ellipse at bottom, #0d1ffc, transparent);
    color: #0f2f05;
}
.cours a {
    display: inline-block;
    margin-right: 12px;
    margin-bottom: 8px;
    padding: 10px 14px;
    border-radius: 4px;
    text-decoration: none;
    background:
        radial-gradient(ellipse at top, #ef6015, #10e46a),
        radial-gradient(ellipse at bottom, #4d900a, #ade43d);
    color: white;
    transition:
        background 0.5s,
        color 0.5s;
}
.cours a:hover {
    background:
        radial-gradient(ellipse at top, #d6d4e6, transparent),
        radial-gradient(ellipse at bottom, #adaf0e, transparent);
    color: #0f2f05;
}
main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px 30px;
}
.viewer {
    width: 100%;
    height: auto;
    border: 1px solid #d1d5db;
    border-radius: 12px;
    overflow: hidden;
    background: white;
    display: flex;
    align-items: center;
}
.machine {
    width: 33.33%;
    height: auto;
    border: inherit;
    border-radius: inherit;
    background: inherit;
    text-align: center;
}
#img_disp {
    width: -moz-available;
    display: -webkit-box;
}
.grpm {
    border: 1px solid #d1d5db;
    padding: 10px;
    margin-bottom: 20px;
}
.refresh {
    width: -moz-available;
    border: none;
    padding: 1em;
    margin-left: auto;
    margin-right: 1em;
    margin-bottom: 10px;
    background: radial-gradient(red, #f5f7fb, #f5f7fb);
    transition: 
        color 0.5s;
        background 0.5s;
}
.refresh:hover {
    padding: 1em;
    margin-left: auto;
    margin-right: 1em;
    margin-bottom: 10px;
    background: radial-gradient(red, #f5c7fb, #f5f7fb);
}