body {
    margin: 1rem auto;
    padding: 3rem;
    font-family: sans-serif;
}

header {
    width: 50%;
    margin: 1em auto;
}

main {
    min-width: 25rem;
    max-width: 50%;
    margin: 0px auto;
    display: flex;
    flex-direction: column;
}

#statement {
    border: 1px solid black;
    border-radius: 0.5rem;
    box-shadow: 5px 5px 5px gray;
    padding: 1rem;
    font-size: x-large;
    text-align: center;
    margin: 1rem 0px;
    min-height: 2em;
}

#explanation {
    padding: 1rem;
    text-align: center;
}

#options {
    width: 100%;
    display: flex;
    flex-direction: column;
}

button {
    padding: 0.5rem;
    font-size: medium;
    border-radius: 5px;
}

button:hover {
    filter: brightness(85%);
}

button:active,
button:focus {
    filter: brightness(70%);
}

.disabled:hover,
.disabled:active,
.disabled:focus {
    filter: none;
}

.correct {
    background-color: lightgreen;
}

.incorrect {
    background-color: lightpink;
}