*{
    margin: 0;
    padding: 0;
    box-sizing:  border-box;
    font-family: 'Georgia', sans-serif;
}


body{
    background: #000;
    position: relative;
}

/* Landing div */
.header{
    position: relative;
    width: 100%;
    height: 100vh;
    color: #fff;
}

/* rmspc */
#logo{
    font-size: 1.2rem;
    font-weight: bolder;
    position: absolute;
    top: 20px;
    left: 20px;
    font-family: sans-serif;
}

/* Home button */
#top-button{
    background: transparent ; 
    border: 1px solid #fff;
    border-radius: 5px;
    font-size: 0.8rem;
    padding: 10px;
    position: absolute; 
    right: 20px; 
    top: 20px;
    color: #fff;
    font-family: sans-serif;
    outline: none;
    cursor: pointer;
}

/* Physique chimie lycee Galilee */
#legende{
    font-size: 0.6rem;
    position: absolute;
    bottom: 20px;
    left: 20px;
    font-family: sans-serif;
}

#fleche{
    font-size:1.5rem;
    position: absolute;
    bottom: 20px;
    right: 20px;
    color: rgb(100,100,100);
}

/* 2nde. */
#chap-title{
    font-family: 'Georgia';
    font-size: 2rem;
    font-weight: bolder;
    position: absolute;
    top: 30vh;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #111;
    z-index: 2;
    padding: 40px;
    background-color: rgba(255,255,255,0.4);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

#subtitle{
    font-family: 'Georgia';
    font-size: 1.2rem;
    font-weight: bold;
    position: absolute;
    bottom: 20vh;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #111;
    z-index: 2;
    padding: 20px;
    background-color: rgba(255,255,255,0.4);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

#progress{
	background-color: #777;
	height: 10px;
    width: 0;
	position: fixed;
	bottom: 0;
	left: 0;
	z-index: 3;
}

.intercalaire, .bg{
    background: no-repeat center center scroll;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    box-shadow: inset 0px 20px 100px black, inset -20px 0px 100px black;
}

.bg{
    position: absolute; 
    top: 0; 
    left: 0;
    width: 100%;
    height: 100%;
}

.intercalaire{
	height: 60vh;
}

.part-section{
	padding: 5%;
	margin: 0;
    line-height: 1.5rem;
    background-color: #eee;
    color: #111;
}

.part-content p{
    font-family: 'Georgia';
    padding: 20px 0;
    line-height: 2rem;
}

.part-title{
	margin: 20px 0;
	font-size: 1.4rem;  
    text-align: center;
    /* letter-spacing: 0.3rem; */
    /* font-weight: bold; */
    font-family: 'Georgia';
}

.part-content{
    display: inline-block;
    max-width: 100%;
}

.content-div{
    display: inline-block;
    max-width: 100%;
}
.leftside{
    float: left;
    margin-right: 30px;
}

.rightside{
    float: right;
    margin-left: 10px;
}

figure{
    margin: 20px 20px;
    height: 100%;
    box-shadow: 0px 0px 20px 5px #aaa;
}

figure img{
    width: 100%;
}

.part-title::after{
    content:"";
    width: 100%;
    height: 15px;
    border-bottom:1px solid #333;
    display: block;
}

footer{
    height: 50px;
    background-color: #eee;
}

figcaption{
	font-size: 0.8rem;
	text-align: center;
	padding: 0;
	margin: 0;
}

.iframe-container{
	overflow: hidden;
	padding-top: 56.25%;
	position: relative;
}
.iframe-container iframe{
	border: 0;
	left: 0;
	position: absolute;
	top: 0;
	width: 100%;
    height: 100%;
}

.req {
    text-align: center;
    border : solid red ;
    padding : 0.5em;
    max-width: 100%;
}

.ceq {
    text-align: center;
    max-width: 100%;
}

.teq{
    margin:auto; 
    text-align: left;
}

.teq td {
    padding-bottom:20px;
}

#plusButton {
    cursor: pointer;
    position: fixed;
    bottom: 15px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 4;
}

#plusImg {
    transition: transform 0.5s ease;
}

.plusBar {
    opacity: 0;
    min-width:70%;
    background-color: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    min-height: 10vh;
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    transition: opacity 0.5s ease;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    align-items: center;
    padding: 20px;
    z-index: -1;
}

.plusBar a img {
    transition: transform 0.5s ease;
    margin: 20px 20px;
}

.plusBar a img:hover {
    transform: scale(1.5);
}

.plusBar-active {
    opacity: 1;
    z-index: 4;
}

.plusRotate {
    transform: rotate(45deg);
}

@media screen and (min-width:820px){
	.part-section {
		padding: 5% 15%;
	}

    .part-title{
        font-size: 2rem;
    }

    .part-content{
        font-size: 1.2rem;
        line-height: 1.8rem;
    }
    ul{
        line-height: 1.8rem;
    }

    #chap-title{
        font-size: 4rem;
    }

    figcaption{
        font-size: 1rem;
    }

    /*  */
    #logo{
        font-size: 2rem;
    }

    #top-button{
        font-size: 1.2rem;
    }
    #fleche{
        font-size: 2rem;
    }
    #legende{
        font-size: 1rem;
    }

    .intercalaire, .bg{
        background-attachment: fixed;
    }
}