#base-box {
    position: relative;
    z-index: 10;
    width: 375px;
    height: auto;
    background-color: white;
    padding: 0px;
    margin: 0px;
    border: 0px;
}
#question{
    position: absolute;
    display: block;
    z-index: 20;
    width: 375px;
    height: auto;
    background-color: white;
    padding: 0px;
    margin: 0px;
    border: 0px;
}
#canvas {
    position: absolute;
    display: block;
    z-index: 30;
    width: 375px;
    height: 667px;
    background-color: rgba(0, 0, 0, 0);
    padding: 0px;
    margin: 0px;
    border: 0px;
    pointer-events: none;
}
a {
    z-index: 50;
}
#question td {
    border-bottom: 1px solid black;
}
#qw td {
    border: 0px none;
    max-width: 7rem;
}
#kouho {
border-collapse: collapse;
}

#kouho th, .kouho td {
    border: 1px solid gray;
}