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CSS Base

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              <h1>Exercices du jour</h1>
  <li>image qui fait la taille de l'écran</li>
  <li>Titre de niveau 2, vert et en majuscule, avec un paragraphe</li> 
  <li>Un texte avec des lettres espacées de 2px, qui font 50px de taille et qui ont une couleur de fond bleu</li> 
  <li>Formulaire avec un champ de saisie et un bouton avec une bordure rouge</li>
  <li>Faites un paragraphe qui contient un lien rouge avec un fond noir avec une bordure verte pointillée de 3px vers un site web de votre choix</li>
  <li>Faites une liste à puce avec un espacement de 10px entre chaque ligne</li>
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