body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-family: Arial, sans-serif;
}

#app {
    display: flex;
    width: 80%;
    margin: 20px;
}

#user-cards {
    width: 30%;
    border: 1px solid #ccc;
    padding: 10px;
}

#calendar {
    width: 70%;
    border: 1px solid #ccc;
    padding: 10px;
}

button {
    margin: 10px;
    padding: 10px;
}

.card {
    margin-bottom: 10px;
    padding: 10px;
    border: 1px solid #000;
    background-color: #f0f0f0;
    cursor: move;
}

.case {
    width: 100px;
    height: 100px;
    margin: 5px;
    display: inline-block;
    text-align: center;
    vertical-align: top;
    border: 1px solid #000;
}

.case.bleu-ciel {
    background-color: #87CEEB;
}

.case.rouge {
    background-color: #FF0000;
}

.case.jaune {
    background-color: #FFFF00;
}

.case.vert {
    background-color: #008000;
}