.navbar ul :first-child a {
    color: #ef961d;
    border-bottom: solid;
}

.navbar ul :first-child a::before {
    opacity: 100%;
}

.naviguer ul :first-child a {
    color: #ef961d;
}

.naviguer ul :first-child a::before {
    opacity: 100%;
}


.logo {
    display:block;
    color: #ef961d;
    font-size: 2em;
    font-family: Helvetica;
    padding-left: .5em;
    padding-top: 0.6em;
}

.definition {
    float:left;
    width:40%;
    margin-top: 5em;
    margin-left:5em;
}

.definition .def {
    font-family: Helvetica;
    letter-spacing: .05em;
    line-height: 1.5em;
    margin-left: 2em;
    font-size: 1vw;
    color: #fff;
}

.definition h1 {
    color: #fff;
    font-family: "KG";
    font-size: 2vw;
    margin-top: 8%;
    letter-spacing: .05em;
    line-height: 2em;
    margin-left: 2.8em;
}

.img {
    display:block;
    margin:auto;
    width: 8vw;
    height: 8vw;
    margin-bottom:1vh;
    animation-name: rotate;
    animation-duration: 5s;
    animation-iteration-count: infinite;
}

#droite{
    clear:right;
    float:right;
    margin-right: 10vw;
    margin-top: 15em;
}

.bibliographie {
    width: 25vw;
    height: auto;
    color: #fff;
    background: rgba(0, 0, 72, 0.57);
    border-radius: 1em;
    padding: .5em;
    display:block;
}

.bibliographie h1 {
    text-decoration: none;
    color: #fff;
    font-family: Helvetica;
    font-weight: bold;
    font-size: 1.5vw;
    letter-spacing: .05em;
    line-height: 2em;
    text-align: center;
}

.bibliographie ul {
    margin-left: 1.8em;
    list-style: none;
    font-size: 1.2vw;
    margin-top: 1em;
    padding-bottom:1em;
}

.bibliographie ul li{
    margin-top: .5em;
    
}

.bibliographie ul li a{
    text-decoration: none;
    color: #fff;
    font-family: Helvetica;
    font-weight: bold;
    transition: .4s ease;
    
}

.bibliographie ul li a:hover {
    text-decoration: none;
    color: #ef961d;
    transition: .4s ease;
}

.bibliographie ul li a::before{
    content:"> ";
    font-size: .8em;
    opacity: 0%;
}

.bibliographie ul li a:hover::before{
    opacity: 100%;
}

@keyframes rotate {
	0% {
		transform: rotateY(0deg) ;
	}

	100% {
		transform: rotateY(360deg);
	}
}

@media screen and (max-width:93em) {
    .definition .def {
        font-size: 1.2vw;
    }
    .definition h1 {
        font-size: 3vw;
    }
    .definition {
        margin-top: 5em;
    } 
}

@media screen and (max-width:68em) {
    .navbar {
        display:none;
    }
    
    .menu2 {
        display:block;
    }
}

@media screen and (max-width:55em) {
    .img {
        display:none;
    }
    
    .definition {
        width: 90%;
        margin-left:5%;
        margin-right:5%;
    }
    
    .definition .def {
        font-size: 1em;
        margin:0;
    }
    
    #droite {
        width: 90%;
        margin:2em 5%;
    }
    .bibliographie {
        width:100%;
    }
    .bibliographie ul {
        margin:1em 0;
        font-size: 1em;
    }
    .bibliographie li {
        display:inline-block;
        width:32%;
        text-align: center;
    }
    .bibliographie h1 {
        font-size: 1em;
    }
    .definition h1 {
        text-align: center;
        font-size: 2em;
        margin: 0;
    }
}