#logo{
    background-color:#b3dbdc ;
}
main{
    background-color:rgba(203,239,255,0.6) ;
}
main h4{
    margin:0;
    padding:20px;
    font-size: 1.8em;
}
main h2{
    margin:0;
    padding-left:20px;
    padding-top:20px;
    padding-bottom: 10px;
    text-decoration: underline;
}
main h3{
    margin:0;
    padding-left:20px;
    padding-top:20px;
    padding-bottom: 20px;
    font-size: 1.8em;
}


.pub,.spec_pub{
    display: none;
}
.pub_recents{
    display: flex;
    justify-content: center;
    flex-direction: column;
    align-items: center;
}
.pub a, .spec_pub a ,.pub_recents a{
    text-decoration: none;
    font-weight: 600;
}
.pub p, .spec_pub p, .pub_recents p{
    display: list-item;
    width:89%;
    margin-left:20px;
    text-align: justify;
    cursor: pointer;
}
.pub p:hover a, .spec_pub p:hover a, .pub_recents p:hover a{
    text-decoration: underline;
}
.container{
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    padding-bottom: 25px;
}
.colective_items{
    min-width:400px;
    align-self: baseline;
}
.colective_items p {
    display: block;
}
.year_of_publication.colective {
    width:60%;
}
.year_of_publication.colective.wider {
    width:70%;
}
.year_of_publication,.title_dropdown{
    display: flex;
    justify-content: space-between;
    border: 1px solid black;
    padding: 10px 10px 10px 60px;
    width: 70%;
    margin:10px;
    font-size:1.8em;
    font-weight: 700;
    cursor: pointer;
    user-select: none;
}
.year_of_publication p {
    margin:0;
    align-self: center;
    padding-right:10px;
}
.wider{
    width:90%;
    transition-duration: 0.5s;
}
.plus_icon{
    align-self: center;
    font-size: 30px;
    margin-right: 30px;
    transform: rotateZ(45deg);
}
.turn{
    transition-duration: 0.5s;
    transform:rotateZ(90deg);   
}
.year_of_publication:hover p,.year_of_publication:hover span{
    color: #008f9f;
}
.visible{
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/* responsive design */
@media screen and (max-width: 1200px) {
    .year_of_publication.colective{
        font-size:1.3em;
    }
    .bigger_letter{
        font-size: 28.8px;
    }
}

@media screen and (max-width: 992px) {
    main h4, main h2, main h3{
        font-size: 1.3em;
    }
    .year_of_publication{
        padding-left: 30px;
    }
    .year_of_publication.colective{
        font-size:1.1em;
    }
    .year_of_publication,.title_dropdown{
        font-size:1.5em;
    }
    .bigger_letter{
        font-size: 24px;
    }
    .plus_icon{
        font-size:25px;
    }
}

@media screen and (max-width: 768px) {
    main h4, main h2, main h3{
        font-size: 1.05em;
    }
    .year_of_publication.colective{
        font-size:1em;
    }
    .year_of_publication,.title_dropdown{
        font-size:1.3em;
    }
    .bigger_letter{
        font-size: 20.8px;
    }
    .pub a, .spec_pub a ,.pub_recents a,.pub p, .spec_pub p, .pub_recents p{
        font-size: 14px;
    }
}

@media screen and (max-width: 576px) {
    main h4, main h2, main h3{
        font-size: 0.98em;
    }
    .year_of_publication.colective{
        font-size:0.9em;
        padding-left: 10px;
    }
    .year_of_publication,.title_dropdown{
        font-size:1.1em;
    }
    .bigger_letter{
        font-size: 17.6px;
    }
    .pub p, .pub_recents p{
        margin-left:10px;
    }
    .plus_icon{
        margin-right:15px;
    }
    .colective_items{
        min-width:230px;
        max-width:230px;
        align-self:center
    }
    .colective_items p {
      text-align: left;
      margin-left:20px;
    }
}