table, th, td {
    border:1px solid black;
}
label {
    padding-right: 1vw;
}
.explain {
    width: 50vw;
}
@media screen and (max-width: 800px) {
    .explain {
        width: 100%
    }
}
.intro_container {
    max-width: 90%;
    width: 90%;
    padding: 2px;
    margin: 2px;
    border: 2px solid black;
    margin : auto;
}