/* couleur de la couverture */

:root{
    --couleur: #2ad4e0;
}


/* motif de bordure généré avec maxbittker.github.io/broider/ */

.couverture,
header {
    
    border-image:  url("data:image/png;base64,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") 28 /  28px / 0 round;
    border-width:  28px;
    border-style:  solid;
}