canvas {
    border: 1px solid black;
}
button#clear{
    width: 10%;
    min-width: 50px;
    aspect-ratio: 3/1;
    background-color: #ffa;
}
button#answer{
    width: 10%;
    min-width: 50px;
    aspect-ratio: 3/1;
    background-color: #afa;
}
button#next{
    width: 10%;
    min-width: 50px;
    aspect-ratio: 3/1;
    background-color: #faa;
}
details details {
    margin-left: 1em;
}