*{
    box-sizing: border-box;
    padding: inherit;
}

body{
    font-size: 1em;
}

a{
    font-family: sans-serif;
    font-weight: 200;
    text-decoration: none;
    text-transform: uppercase;
    color: white;
    padding: 0.1em 0.1em;
    background-color: #000000;
    transition: background ease-in 200ns;
    margin: 0em;
    cursor: pointer;
    opacity:0.7; 
    transition: opacity .1s;
    cursor: pointer;
}

a:hover{
    background-color: #850606; 
}

.wrapper{
    margin: 0 auto;
    width: 100%;
    position: fixed;
    /*sert à passer devant tout le monde*/
    z-index: 999999;
    height: 4.5em;
    background-color: black;
}

header{
    border-bottom: 0.5em solid #eee;
    height: 4em;
}

header li{
    display: inline-block;
    vertical-align: top;
}

header li a{
    display: block;
    padding: 1.15em;
}

@media only screen and (max-width: 350px) {
    header li a{
        font-size: 0.4em;
    }
}

@media only screen and (min-width: 350px) and (max-width: 600px) {
    header li a{
        font-size: 0.6em;
    }
}

header li:hover a{
    background-color: #91283B;
    color: #fff;
}

header li:hover .sub-menu{
    display: block;
}

.sub-menu{
    display: none;
    background-color: #91283B;
    width: 11em;
}

@media only screen and (max-width: 350px) {
    .sub-menu{
        width: 5em;
    }
}

@media only screen and (min-width: 350px) and (max-width: 600px) {
    .sub-menu{
        width: 7em;
    }
}

.sub-menu li{
    display: block;
}

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

.sub-menu li:hover a{
    background-color: #fff;
    color: #1abc9c;
}