#header_bar{
    position: relative;
    z-index: 3;
    top: 0;
    background-color: #5BC0DE; 
    width:100%; 
    height:90px;
    color: white;
    box-shadow: 10px 0px 10px 0px black;
}
body{
    margin: 0;
    padding: 0;
    word-wrap: break-word;
}
.a{
    color: white;
    text-decoration: none;
}
.a:hover{
    color: white;
    text-decoration: none;
}
#header_title{
    font-size: 25px;
    font-family: Arial, Helvetica, sans-serif;
}
#header_subtitle{
    padding-top: 4px;
    margin-left: 5px;
    color:white;
    font-size:19px;
    font-family: Arial, Helvetica, sans-serif;
}
#img_caducee{
    float: left;
    height: 70px;
    width: auto;
    padding-left: 5px;
}
#title_content{
    margin-left:10px;
    float: left;
    padding-left:10px;
    padding-top: 2px;
}
@media screen and (min-width:900px){
    #header_part_left{
        padding-left:10px;
        height: auto;
        text-align: left;
        padding-top: 8px;
        margin-bottom: auto;
        float: left;
    }
    #header_part_right{
        float: right;
        text-align: center;
        width: 40%;
        margin-right: 50px;
        height: auto;
    }
    .menu_item{
        width: 30%;
        float: right;
        border-left: solid 2px white;
        font-size:18px;
        margin-top:27px;
    }
    .menu_item > a:hover{
        font-size:22px;
        font-style: inherit; 
    }
    #header_contact{
        border-right: solid 2px white;
    }
    a{
    text-decoration: none;
    color:white;   
    }
}
@media screen and (max-width:900px){
    #title_content{
        margin: 0;
    }
    #header_bar{
        padding: 0;
        height: 50px;
    }
    #header_title{
        line-height: 5px;
        margin-left: 0;
        margin-top: 5px;
        font-size: 18px;
    }
    #header_subtitle{
        margin-top: 5px;
        font-size: 12px;
    }
    #header_part_left{
        z-index: 1;
        height: auto;
        width: auto;
        text-align: left;
        padding-top: 8px;
        margin-bottom: auto;
        float: left;
    }
    #header_part_right{
        border: solid 1px black
        z-index: 2;
        position: absolute;
        top: 0px;
        right: 1px;
        text-align: center;
        width: 80px;
        background-size: 40px 50px;
        min-height: 60px;
        background-position-x: right;
        background-position-y: 1px ;
        background-image: url("../img/menu.png");
        background-repeat: no-repeat;
        background-origin: border-box;
    }
    #img_caducee{
        float: left;
        height: 40px;
        margin-right: 0;
    }
    .menu_item{
        position: relative;
        display: none;
        height: 62px;
        width: 80px;
        margin-right: 10px;
        right: 0;
        padding-top: 28px;
        background-color:white;
        border: solid 1px black;
    }
    .menu_item > a:hover{
        font-weight: bold; 
    }
    .menu_item > a{
        font-family: Arial, Helvetica, sans-serif;
        text-decoration: none;
        color:#0CB5E8;
    }
    #header_part_right:first-child {
        margin-top: 90px;
    }

}