#background {
    display: block;
    top: 0; left: 0;
    width: 100%; height: 100%;
    position: absolute;

    background-image: linear-gradient(90deg, rgba(255, 188, 30, 0.5), rgba(94, 115, 254, 0.5));
    background-size: 200% 150%;

    z-index: -1;
}

#btn_container {
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    align-items: center;
}

#btn_container button {
    width: 100%;
    height: 40px;
    margin: 4px;
    font-size: 1rem;
    background-color: var(--secondary_color);
    border-radius: 4px;

    color: var(--primary_color);
}

#btn_container .answer_button_correct {
    background-color: greenyellow;
}

#btn_container .answer_button_wrong {
    background-color: red;
}

#btn_container button:hover {
    color: var(--hover_color);
}

#question_container {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    color: var(--primary_color);
}

#question_container * {
    width: 100%;
    max-height: 320px;
    font-size: 1.25rem;
    color: var(--primary_color);
}

#navbar {
    display: flex;
    justify-content: space-between;
    color: var(--primary_color);
}

#navbar > * {
    width: 150px;
}

#navbar #nav_button_container {
    display: flex;
    justify-content: flex-start;
}

#navbar #nav_button_container a {
    margin-right: 8px;
}

#navbar a {
    text-decoration: none;
}

#navbar a:visited {
    color: var(--primary_color);
}

#navbar a:hover {
    color: var(--hover_color);
}

#navbar p {
    margin: 0;
    text-align: center;
    font-family: 'Titan One', cursive;
}

#heart_container {
    text-align: right;
    color: var(--heart_color);
}

#loading_spinner {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(0,0,0,0.5);
    z-index: 1;
}