body {
    background-image: url('https://pulsa.studio/wp-content/uploads/2022/01/Pulsa_Studio_Header_E-commerce.jpg');
    font-family: Arial, Helvetica, sans-serif;
    
}

.presentation {
    position: absolute; /* postulat de départ */
    top: 50%; left: 50%; /* à 50%/50% du parent référent */
    transform: translate(-50%, -50%); /* décalage de 50% de sa propre taille */
    background: rgb(55,41,238);
    background: linear-gradient(180deg, rgba(55,41,238,1) 0%, rgba(19,7,81,1) 100%);
    width:25vw;
    margin: auto;
    padding: 50px;
    border-radius: 15px;
    text-align: center;
}

h1 {
    color: white;
}

p {
    color: white;
}

.button {
    margin-top: 100px;
    color: rgba(19,7,81,1);
    text-decoration: none;
    padding: 10px;
    border-radius: 100px;
    background: rgb(254,231,2);
    background: linear-gradient(90deg, rgba(254,231,2,1) 0%, rgba(245,129,32,1) 100%);
}