body,
html {
    height: 100%;
}

#main-container {
    padding-top: 35px;
    height: calc(100% - 110px);
    background-position-y: -100px;
    background-size: cover;
}

#main-container .presentation {
    display: block;
    text-align: center;
    margin: auto;
}

#main-container .presentation h1 {
    font-family: 'NouvelRBold';
    font-size: 40px;
}

#main-container .presentation hr {
    width: 55px;
    height: 0;
    border-bottom: 4px solid #000;
    border-top: none;
    margin: auto;
    margin-top: 20px;
    margin-bottom: 20px;
}

#main-container .presentation p {
    font-family: 'NouvelRRegular';
    font-size: 22px;
    margin-bottom: 0;
}

#main-container .presentation p b {
    font-family: 'NouvelRBold';
}

#main-container .btn-next {
    height: 105px;
    width: 100%;
    background-color: #000;
    color: #FFF;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bolder;
    font-size: 35px;
    border-radius: 0;
    font-family: 'NouvelRBold';
}

#main-container .btn-next:hover {
    background-color:#888 ;
}

@media(orientation:portrait) {
    #main-container .presentation h1 {
        font-size: 25px;
    }
    #main-container .presentation p {
        font-size: 18px;
        line-height: 22px;
        margin-bottom: 0;
    }
    #main-container .btn-next {
        height: 61px;
        font-size: 22px;
    }
    #main-container {
        padding-top: 30px;
        height: calc(100% - 55px);
        background-position-y: -60px;
    }
}