index.css

:root {
    --switch-value: 0px;
}
body {
    background-color: #f1f1f1;

}

* {
    font-family: 'Open Sans', 'Segoe UI', 'Helvetica Neue', sans-serif;
}

#switch-mode {
    width: 60px;
    height: 30px;
    padding: 0;
    margin: 5px;
    vertical-align: middle;
    background-color: #474747;
    border-radius: 15px;
    border: none;
}

#switch-mode::before {
    content: '';
    display: block;
    position: absolute;
    height: 30px;
    width: 30px;
    margin-top: -15px;
    border-radius: 50%;
    background-color: #888888;
    transition: 0.3s;
    transform: translateX(var(--switch-value));
}

#switch-mode:hover::before {
    background-color: #c4c4c4;
}

#container {
    display: flex;
    width: 90vw;
    height: 90vh;
}

#svg839 {
    width: auto;
    height: 100%;
    margin: 20px;
}

#infoBloc {
    padding: 10px;
    margin: 10px 0;
    width: 400px;
    min-height: min-content;
    height: min-content;
    background-color: #e1e1e1;
    border-radius: 10px;
    box-shadow: 5px 3px 12px 5px rgba(0, 0, 0, 0.1);

    opacity: 0;
    transition: opacity 500ms ease-in-out;
}

#infoBloc > h2 {
    margin-bottom: 0;
    width: 100%;
    text-align: center;
    font-size: 26px;
}

#infoBloc #underline {
    content: "";
    display: block;
    margin: auto;
    width: 168px;
    height: 2px;
    background-color: black;
    
}

.animation {
    animation: apparition-barre 1s;
}


@keyframes apparition-barre {
    from {
        width: 0px;
    }

    to {
        width: 168px;
    }
}

@media screen and (max-width: 600px) {
    #container {
        display: block;
        text-align: center;
    }
    #svg839 {
        width: 80%;
        height: min-content;
    }
    #infoBloc {
        margin: 20px auto;
        width: 80%;
    }
}

#infoBloc p , #infoBloc span{
    font-size: 18px;
}

#infos h3 {
    font-size: 22px;
}

#quizz {
    margin-top: 20px;
}

input {
    padding: 3px;
    margin: 3px 6px;
    width: 180px;
    border: none;
    border-radius: 5px;
    font-size: 18px;
}

#quizz button {
    display: block;
    margin: 20px auto;
    font-size: 18px;
    padding: 10px;
    
}