/* Réinitialisation des marges et des paddings */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
h1{
    text-align: center;
    font-size: 3rem;
    background-color: gray;
}
h2{
    text-align: left;
    font-size: 3rem;
}
h3{
    text-align: left;
    font-size: 2rem;
}
#image_header {
    padding-top: 80px;
    background: url(./img/image_header.jpg) no-repeat fixed  50% 50%;
    background-size: cover;
    height: 400px;
   
}

/* Styles du menu principal */
.menu {
    list-style: none;
    display: flex;
    background-color: #333;
    justify-content: center;
    align-items: center;
    height: 50px;
}

.menu li {
    margin: 0 15px;
}

.menu a {
    text-decoration: none;
    color: #fff;
    transition: color 0.3s;
}

.menu a:hover {
    color: #ff9900;
}

/* Styles du sous-menu */
.submenu {
    position: relative;
}

.sub-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #444;
    z-index: 1;
    min-width: 200px;
}

.submenu:hover .sub-menu {
    display: block;
}

.sub-menu li {
    padding: 10px;
}

.sub-menu a {
    color: #fff;
}

.sub-menu a:hover {
    color: #ff9900;
}

/* Rendre le menu réactif */
@media screen and (max-width: 768px) {
    .menu {
        flex-direction: column;
        height: auto;
    }
    .submenu:hover .sub-menu {
        display: none;
    }
    .menu li {
        margin: 5px 0;
    }
    .submenu:hover .sub-menu {
        display: block;
        position: static;
        background-color: transparent;
    }
}

/* Boite calendrier */
/* boite ??? */
.boite {
    width: 40%;
    height: 400px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 50px;
}

.casier {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    background-color: gray;
    border: green solid 5px;
    /* border: white solid 5px; */
}
.case_1 {
    border: white solid 1px;
    width: 20%;
}
.case_2 {
    height: 400px;
    width: 50%;
    background-color: gray;
    border: black solid 1px;
    justify-content: left;
}

footer {
        background-color: gray;
    }

.bordure{
    border-width: 2px;
    border-style: solid;
    border-color: red;
    margin: 5%;

}