body {
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
        Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans",
        "Helvetica Neue", sans-serif;
}

#pick {
    font-size: .85em;
    display: inline;
    color: blue;
    cursor: pointer;
    padding-bottom: 1em;
    float: left;
    user-select: none;
}
#reset {
    font-size: .85em;
    display: inline;
    color: blue;
    cursor: pointer;
    padding-bottom: 1em;
    float: right;
    user-select: none;
}
#solve {
    font-size: 1em;
    font-weight: bold;
    margin: 1em;
}

input {
    width: 2em;
    height: 2em;
}

td {
    margin: 0;
    padding: 0;
}

h1 {
    font-weight: bold;
    font-size: 2em;
}

#outer-table {
    background-color: black;
}
.inner-table {
    background-color: gray;
}