*, *::before, *::after {
    box-sizing: border-box;
    font-family:'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif
}

:root {
    --light-neutral : #2080da;
    --neutral: #1864ab;
    --correct: #2f9e44;
    --wrong: #e03131;
}

body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100vw;
    height: 100vh;
    background-color: var(--neutral);
}

body.correct {
    background-color: var(--correct);
}

body.wrong {
    background-color: var(--wrong);
}

main {
    width: 800px;
    max-width: 80%;
    padding: 10px;
    background-color: white;
    border-radius: 5px;
    box-shadow: 0 0 10px 2px;
}
#answer-buttons {
    display: grid;
    grid-template-columns: repeat(2, auto);
    gap: 10px;
    margin: 20px 0;
}
.btn {
    padding: 5px 10px;
    border: 2px solid var(--neutral);
    border-radius: 5px;
    background-color: var(--light-neutral);
    color: white;
}
.btn:active {
    position: relative;
    top: 1px;
}
.btn:hover {
    border-color: black;
}
.btn.correct {
    background-color: var(--correct);
}
.btn.wrong {
    background-color: var(--wrong);
}
.start-btn, .next-btn {
    font-size: 20px;
    font-weight: bold;
    padding: 10px;
}
#controls {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hide {
    display: none;
}