*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:Arial, Helvetica, sans-serif;
}

body{
    min-height:100vh;

    background-color:#f5f5f5;

    background-image:url("Model-WonckStock.v2.0.Fond-TR.Ombre.png");
    background-repeat:no-repeat;
    background-position:center center;
    background-size:90% auto;
}

.overlay{
    min-height:100vh;

    display:flex;

    justify-content:flex-end; /* droite */
    align-items:flex-end;     /* bas */

    padding:40px;

    background:rgba(255,255,255,0.15);
}

.formulaire{
    display:none;
    width:400px;
    max-width:90vw;

    padding:30px;

    background:rgba(255,255,255,0.95);

    border-radius:15px;

    box-shadow:0 0 25px rgba(0,0,0,0.15);
}

h1{
    text-align:center;
    margin-bottom:25px;
}

input,
textarea{
    width:100%;

    padding:12px;
    margin-bottom:15px;

    border:1px solid #ccc;
    border-radius:8px;

    font-size:15px;
}

textarea{
    min-height:150px;
    resize:vertical;
}

button{
    width:100%;

    padding:12px;

    border:none;
    border-radius:8px;

    background:#000;
    color:#fff;

    font-size:16px;
    cursor:pointer;
}

button:hover{
    opacity:0.85;
}